Garmin 0163700 Spread Spectrum Digital Transmission 2402-2480 MHz User Manual

Garmin International Inc Spread Spectrum Digital Transmission 2402-2480 MHz

User Manual 2

8-12Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex8.4 VORThe VOR page of the Waypoint Info function provides a variety of detailed information about the VOR. The top left area of the page displays the VOR identifier, name, city and state, and region. The top center area shows the lat/lon coordinates of the VOR and the bearing (with direction arrow) and distance to the VOR from your present position. The top right area shows the frequency in a key. Select another Waypoint by touching the Waypoint Identifier key, entering the characters for the desired name with the alphanumeric keypad, and then touching the Enter key. You may also search through the list by touching the Find key and then choosing from the existing list of waypoints by touching the desired waypoint from the list. The center area of the page shows a map with the VOR in the center. 1. While viewing the Waypoint Info page, touch the VOR key. Distance & Bearing To VOR From Current PositionVOR Identifier, Symbol, & NameVOR Area MapTouch & Move Finger While Pressing To Pan MapVOR Lat/LonTouch To ZoomNearest Airport InformationVOR Symbol & IdentifierMap ScaleVOR Location & RegionVOR Class Magnetic VariationVOR Frequency - Touch To Insert Into Nav StandbyFigure 8-16 Waypoint Info - VORs 2. Use the In and Out keys to zoom in and out on the map. You may touch the map window and while lightly pressing the display, drag your finger to move the map view. 3. Touch the Frequency key next to load it as the Nav standby frequency. 190-01007-03-Final.indb 12 7/9/2015 2:07:27 PM
8-13190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex8.5 NDBThe NDB page of the Waypoint Info function provides a variety of detailed information about the NDB. The top left area of the page displays the NDB identifier, name, city and state, and region. The top center area shows the lat/lon coordinates of the NDB and the bearing (with direction arrow) and distance to the NDB from your present position. The top right area shows the frequency in a key. Select another Waypoint by touching the Waypoint Identifier key, entering the characters for the desired name with the alphanumeric keypad, and then touching the Enter key. You may also search through the list by touching the Find key and then choosing from the existing list of waypoints by touching the desired waypoint from the list. The center area of the page shows a map with the NDB in the center. 1. While viewing the Waypoint Info page, touch the NDB key.Distance & Bearing To NDB From Current PositionNDB Identifier, Symbol, & NameNDB Area MapTouch & Move Finger While Pressing To Pan MapNDB Lat/LonTouch To ZoomNearest Airport InformationNDB Symbol & IdentifierMap ScaleNDB Location & RegionMarker DescriptionNDB FrequencyFigure 8-17 Waypoint Info for NDBs 2. Use the In and Out keys to zoom in and out on the map. You may touch the map window and while lightly pressing the display, drag your finger to move the map view. 190-01007-03-Final.indb 13 7/9/2015 2:07:27 PM
8-14Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex8.6 User Waypoints (User)In addition to the airport, VOR, NDB and intersection information contained in your Jeppesen NavData® card, the GTN 7XX allows you to store up to 1,000 user-defined waypoints. The User Waypoint Page displays the waypoint name (up to six characters long), identifier and radial from two reference waypoints, distance from one reference waypoint, along with the user waypoint’s lat/lon position. The following descriptions and abbreviations appear on the User Waypoint Page: • Ref Wpt — Reference waypoint identifier (name)• Radial — Radial from reference waypoint, in degrees magnetic or degrees true (depending upon unit configuration)• Distance — Distance from reference waypoint, in nautical miles/statute miles/kilometers (depending upon unit configuration)• Lat/Lon — Latitude/Longitude (degrees/minutes)Distance & Bearing To Wpt From Current PositionIdentifier, Symbol, & ReferencesArea MapTouch & Move Finger While Pressing To Pan MapReference WptTouch To ZoomDelete WptWpt Symbol & IdentifierMap ScaleWpts UsedView All WptsEdit WptFigure 8-18 Waypoint Info for a User WaypointSelect another Waypoint by touching the Waypoint Identifier key, entering the characters for the desired name with the alphanumeric keypad, and then touching the Enter key. You may also search through the list by touching the View All key and then choosing from the existing list of User waypoints by touching the desired waypoint from the list. 190-01007-03-Final.indb 14 7/9/2015 2:07:27 PM
8-15190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex8.6.1 Select User Waypoint By Name 1. While viewing the User Waypoint page, touch the User Waypoint Name. 2. Use the keypad to select the characters for the name and then touch Enter. 8.6.2 Select User Waypoint From A List 1. While viewing the Waypoint Info page, touch the User Waypoint key. 2. Touch the View All key and then use the Up and Down keys to view the waypoints on the list. User Waypoint TypeUser Waypoint ListUser Waypoint List NameFigure 8-19 Waypoint Info User Waypoint List8.6.3 Edit User Waypoint 1. Select the desired User Waypoint and touch the Edit key. 2. Touch the key for the desired information and make changes as needed. 8.6.4 Delete User Waypoint 1. Select the desired User Waypoint and touch the Delete key. 2. Touch the OK key to confirm deleting the selected waypoint. 190-01007-03-Final.indb 15 7/9/2015 2:07:27 PM
8-16Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex8.7 Create WaypointUser waypoints are created from the Create User Waypoint page. To create a new user waypoint, simply enter its name (identifier) and position, or reference another waypoint by radial and distance. Waypoint NameMap Area Around WaypointWaypoint CommentWaypoint TypeTemporary WaypointTouch to Finalize Waypoint CreationTouch To ZoomTouch To Setup Ref Wpt 1Touch To Setup Ref Wpt 2Touch to Cancel Waypoint CreationFigure 8-20 Waypoint Info - Create User Waypoint 1. From the Waypoint Info page, touch the Create Waypoint key. 2. Touch the User Identifier key. 3. Use the alphanumeric keypad to make the waypoint name (up to six characters) and then touch the Enter key. User Waypoint NameAlphanumeric KeypadBackspace Key Clears Wpt NameTouch Enter After Creating NameCursor Movement KeysTouch To Cancel Creating NameFigure 8-21 Waypoint Info - Create User Waypoint Name190-01007-03-Final.indb 16 7/9/2015 2:07:27 PM
8-17190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex 4. Touch the Comment key to add a short comment for the new waypoint. 5. Touch the Position Type key and then Lat/Lon, Radial/Radial, or Radial/Distance to assign the type. See the following instructions for more detail. Touch to Select the Desired Waypoint Position TypeFigure 8-22 Waypoint Info - Create User Position Type 6. If desired, touch the Temporary? key to create the waypoint for only temporary use. Temporary waypoints will be removed when the power is cycled. 7. When finished with all selections, touch the Create key to create the new waypoint. 8.7.1 Mark On TargetIf an external Mark On Target (MOT) switch is installed, pressing that switch will result in the creation of a User waypoint called MOTxxx at the point in space where the MOT switch was pushed. The waypoints are created in increasing numeric order up to number 999, at which point they will start replacing existing waypoints at the beginning of the list. When a Mark on Target waypoint is created, it may not be immediately visible on the moving map page because the ownship icon will be directly on top of the waypoint. Creation of the waypoint can be verified by changing zoom scales on the map or viewing the User Waypoints page. NOTE: This feature is available in software version 4.00 and later. 190-01007-03-Final.indb 17 7/9/2015 2:07:28 PM
8-18Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex8.7.2 Waypoint Location Based on Lat/Lon Coordinates 1. From the Create User Waypoint page, touch the Position Type key and then the Lat/Lon key. Then, touch the Latitude/Longitude value key. Touch to Select Lat/Lon Waypoint Reference TypeFigure 8-23 Waypoint Info - Create User Waypoint Type - Lat/Lon 2. The Lat/Lon coordinate values will be highlighted. Touch the Lat or Lon key to toggle selection of the hemisphere values and highlight the selected value. Touch to Select Hemisphere ValueTouch To Toggle Lat/LonTouch to Select Numeric ValuesWhen The Lat Key Is Touched, The Latitude Hemisphere Value Is Active For SelectionFigure 8-24 Lat/Lon Coordinate Selection 3. Touch the desired hemisphere keys to select the desired values. After selecting the hemisphere value, the cursor will advance to the first character of the adjacent numeric value for selection. 190-01007-03-Final.indb 18 7/9/2015 2:07:28 PM
8-19190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexEven when the hemisphere values are highlighted, touching the numeric keys will always place the cursor at the first numeric value. The Large knob may also be used for cursor movement and characters are selected with the Small knob. NOTE: When editing values, turn the Large knob counter-clockwise to backspace or move the cursor to the left. 4. As each value is selected, the cursor will advance to the next character. Touch the necessary key for the desired values. 5. When finished with the Lat/Lon selections, touch the Enter key. 6. When finished with all selections, touch the Create key to create the new waypoint. 8.7.3 Waypoint Location Based on Two Radials 1. From the Create User Waypoint page, touch the Position Type key and then the Radial/Radial key. Touch to Select Radial/Radial Waypoint Reference TypeFigure 8-25 Waypoint Info - Create User Waypoint Type - Radial/Radial 2. Touch the Ref Wpt key and use the alphanumeric keypad to select the desired identifier. 3. Touch the upper Radial key and use the alphanumeric keypad to select the desired value. 4. Touch the Enter key. 5. When finished with all selections, touch the Create key to create the new waypoint. 190-01007-03-Final.indb 19 7/9/2015 2:07:28 PM
8-20Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex8.7.4 Waypoint Location Based on Radial and Distance 1. From the Create User Waypoint page, touch the Position Type key and then the Radial/Distance key. Touch to Select Radial/Distance Waypoint Reference TypeFigure 8-26 Waypoint Info - Create User Waypoint Type - Radial/Distance 2. From the Create User Waypoint page, touch the Ref Wpt key and use the alphanumeric keypad to select the desired identifier. 3. Touch the upper Radial key and use the alphanumeric keypad to select the desired value. 4. Touch the upper Distance key and use the alphanumeric keypad to select the desired value. 5. Touch the Enter key. 6. Touch the Create key to save the new waypoint. 190-01007-03-Final.indb 20 7/9/2015 2:07:29 PM
8-21190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex8.8 Import User Waypoints (SD Card)The GTN can import user generated waypoints from a file on the SD card. The created waypoints will be at the latitude and longitude specified in the file with the specified name and comment. NOTE: This feature is available in software version 5.10 and later. When a user waypoint file is on the SD card, a key will be available on the Waypoint Info page for importing user waypoints. 1. Insert an SD card with the User waypoints into the the GTN. 2. From the Waypoint Info page, touch the Import Waypoints key. 3. Touch OK to acknowledge the pop-up to import all of the user waypoints in the file. Figure 8-27 Start User Waypoint Import190-01007-03-Final.indb 21 7/9/2015 2:07:29 PM
8-22Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex 4. The pilot is informed of the status of the user waypoint import via one of the following system messages. Message DescriptionUSER WAYPOINT IMPORT - User waypoints were imported successfully. All user waypoints were imported successfully. USER WAYPOINT IMPORT - User waypoint import failed. User waypoint import failed due to improper file format. USER WAYPOINT IMPORT - User waypoint import failed. User waypoint database is full. User waypoint catalog is full and the requested user waypoints could not be imported. USER WAYPOINT IMPORT - User waypoints imported successfully - existing waypoints reused. User waypoints imported and existing waypoints are used instead of creating duplicate waypoints. This occurs when a waypoint to be imported is within 0.001° latitude and longitude of an existing user waypoint (roughly a few hundred feet, depending on latitude). Table 8-1 User Waypoint Import Messages190-01007-03-Final.indb 22 7/9/2015 2:07:29 PM
9-1190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex9 MAPThe Map page is used to provide situational awareness in flight. The Map page can display the following information: • Airports, NAVAIDs, airspace, airways, land data (highways, cities, lakes, rivers, borders, etc.) with names• Wind direction and speed• Icons for enabled map features• Aircraft icon (with the nose representing present position)• Nav range ring• Flight plan legs• Topography scale• Topography data• NEXRAD (or Precip) Weather (Opt.)• ChartView or FliteChart Overlay• Terrain Overlay• Traffic Overlay• Radar Overlay• Fuel Range Ring (SW V 6.00 or later)Back to Previous PageRange KeysTouch to Zoom In and OutAircraft Symbol(Present Position)Active FlightPlan LegCDIFrom - To - Next WaypointsMap Menu OptionsCDI - Select Nav SourceOBS - Select Manual or Auto SequencingNav Range RingTouch to View MessagesNorth IndicatorTouch To Edit FPLMap OrientationFigure 9-1 Map Page Description The following information describes the ownship symbol behavior in a helicopter that does not have a source of magnetic heading information connected to the GTN. When greater than 15 knots groundspeed the map is oriented either north up with ownship oriented to its current track or track up. When less than 190-01007-03-Final.indb 1 7/9/2015 2:07:29 PM
9-2Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex15 kts groundspeed, the directional ownship icon is replaced with a non-directional icon because it can't be determined if the rotorcraft is going sideways or backwards. The map will continue to orient to the current track if the map is selected for Track Up. If the map is oriented to track up, then below 5 kts groundspeed the map orientation will "latch" to the last valid track prior to the groudspeed going below 5 kts. The map will reorient when the groundspeed again exceeds 5 kts. The position of the ownship icon over the map is always the current GPS position of the aircraft. NOTE: The electronic map is an aid to navigation and is designed to facilitate the use of authorized government charts, not replace them. Land and water data is provided only as a general reference. The accuracy of the land and water data is not suitable for use as a primary source of navigation and should only be used to supplement official government charts and notices. Map User Fields Change User FieldsRestore Defaults * OptionalTopoAirwaysTerrainNEXRAD (or PRECIP)*Charts*StormScope*Traffic*Radar*Map Overlays Graphically Edit FPLMap Pointer - Create WptMapAviationLandAirspaceTraffic*Weather*Map SetupMap DetailFigure 9-2 Map Page Functional Diagram190-01007-03-Final.indb 2 7/9/2015 2:07:29 PM
9-3190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex NOTE: NEXRAD (or PRECIP) and Radar may not be shown at the same time. 9.1 Map MenuThe Map Menu provides the ability to modify and control the information displayed on the Map page. • Map Overlays are selected to overlay various types of information over the base map. • Map Setup modifies the display of other map features. • Map User Fields determines whether or not the fields in the corners of the Map page are displayed and the data shown in each corner. • Map Detail lets you control the amount of information displayed at different map ranges. • Restore Defaults lets you start all over again with the default values for the settings for the Map User Fields. NOTE: Changes made in the Map Menu take effect immediately on the map display. 1. From the Home page, touch Map to reach the Map page, or press and hold the HOME key to go to the Map page from any function. On the Map page, touch the Menu key. Map Overlay SelectionsTouch and Slide Finger To Adjust Map Detail LevelReturn Map User Fields To Default ValuesTouch To Edit Map SetupTouch To Edit Map User Fields (Corners)Figure 9-3 Map Menu 2. Touch the key for the desired option to access its settings. 190-01007-03-Final.indb 3 7/9/2015 2:07:29 PM
9-4Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex 3. Touch the Back key to return to the Map page. Any changes made will be retained until changed. 9.1.1 Map OverlaysMap Overlays are layers of information that are referenced to geographic location and are overlayed on the base map. A green bar will appear below the Map Overlay key text when the overlay is selected, except for Airways and NEXRAD. NOTE: Data linked weather (SiriusXM / FIS-B / Connext) is displayed below the chart overlay, Active onboard RADAR overlay is displayed above the chart overlay. NOTE: Map overlay keys do not turn on or activate equipment necessary for the overlay to function. Map overlay keys may remain available even if the information necessary for the overlay is not available. For example: the Radar overlay key is available even if the radar is turned off. NOTE: Map overlays for StormScope, Traffic, or Radar are prevented from being overlaid on the main map without a heading source or while User Navigation Angles are selected. 9.1.1.1 Overlay PriorityThe data overlayed on the map is displayed according the following priorities (from highest to lowest): 1 - Traffic 10 - TFRs 19 - County Warning28 - Icing Potential2 - Ownship 11 - Freezing Levels 20 - PIREPs 29- Echo Tops3 - Flight Plan 12 - Cell Movement 21 - AIREPS 30 - NEXRAD4 - TAWS Alerts 13 - Lightning 22 - City Forecast 31 - Cloud Tops5 - Weather Radar 14 - METARs 23 - Surface Analysis32 - IR Satellite6 - Charts 15 - Winds Aloft 24 - Airspace 33 - SafeTaxi7 - Stormscope 16 - SIGMETs 25 - Waypoints 34 - Terrain8 - Obstacles 17 - AIRMETs 26 - Airways 35 - Base Map9 - Fuel Range Ring 18 - Cyclone Warning27 - Turbulence 36 - TopoTable 9-2 Data Overlay Priority190-01007-03-Final.indb 4 7/9/2015 2:07:30 PM
9-5190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.1.1.2 TopoThe Topo Data option selects whether the colored topographical features are displayed. Traffic, Land Data, Terrain, and Obstacles will still be displayed even with Topo Data turned off. 1. While viewing the Map Menu, touch the TOPO Map Overlay key to toggle the Topo setting. Topo Map Overlay Off Topo Map Overlay OnFigure 9-4 Topo Map Overlay Selections 2. When the Topo Map Overlay is toggled off, all topographic color features are removed. 9.1.1.3 AirwaysThe Airways option allows you to select the airways that are shown on the Map page. All, Low only, and High only Airways may be selected. When Off is selected, airways will not be shown. 1. While viewing the Map Menu, touch the Airways Map Overlay key to select the Airways viewed. Selections are: Off, Low, High, and All. 190-01007-03-Final.indb 5 7/9/2015 2:07:30 PM
9-6Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexLow Airway (Grey)High Airway (Green)Active Flight Plan LegFigure 9-5 Map Menu Airways Map Overlay Selection 2. Low Airways are shown as grey lines. High Airways are shown as green lines. 190-01007-03-Final.indb 6 7/9/2015 2:07:30 PM
9-7190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.1.1.4 TerrainThe Terrain Data option selects whether Terrain Data is shown on the Map page. Terrain and NEXRAD weather may not be displayed at the same time. Selecting one will disable the other. A Terrain icon will indicate that the Terrain overlay has been selected. Terrain overlay colors may or may not be shown depending on the altitude of the aircraft. 1. While viewing the Map Menu, touch the Terrain Map Overlay key to toggle the view of Terrain data. Touch to Zoom Map RangeRed Terrain - At or Within 100 ft below Aircraft AltitudeCurrent PositionYellow Terrain - Between 100 ft and 1000 ft below current aircraft altitudeIcon Shows Terrain Overlay Is ActiveFigure 9-6 Map Menu Terrain Map Overlay "On" Selection 2. The colors of the terrain are referenced to your aircraft altitude. 190-01007-03-Final.indb 7 7/9/2015 2:07:30 PM
9-8Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.1.1.5 NEXRAD (Optional)The NEXRAD menu option allows the display of NEXRAD Precip weather information overlayed on the Map page. Terrain and NEXRAD Precip weather may not be displayed at the same time. Selecting one will disable the other. NEXRAD Precip weather is an optional feature that requires the installation of a GDL 69/69A, GDL 88, or GSR 56 and an appropriate Weather subscription. Only one weather source can be displayed at a time (i.e. FIS-B and XM cannot be displayed on the map simultaneously. See the Weather section for more detail. While viewing the Map Menu, touch the NEXRAD Map Overlay key to toggle the view of NEXRAD weather data. NEXRAD WeatherNEXRAD Product AgeNEXRAD WeatherFigure 9-7 Map Menu NEXRAD Map Overlay "On" Selection190-01007-03-Final.indb 8 7/9/2015 2:07:30 PM
9-9190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.1.1.6 Charts (Optional)The Charts menu option allows the display of Charts overlayed on the Map page. The Charts Map Overlay option selects whether Chart data is shown on the Map page. Charts may or may not be shown depending on the other aircraft's location. The ownship icon will be shown over an available chart. See the Charts section for more detail. A chart will be displayed on the map if all of the following are true: • A charts database is a valid database. • The system date is prior to the disable date of the charts database. • The Charts Overlay Setting is active. • The aircraft is In Air. The chart displayed on the map will be chosen based on: • The approach chart for the approach in the active flight plan, if an approach exists in the active flight plan. • The airport surface chart for the nearest airport, if no approach exists in the active flight plan and an airport exists within 200NM of the aircraft's current position. NOTE: Features that are selectable on the main map page, such as obstacles, airports, airspace, and other waypoint types that are not visible beneath the overlaid chart, remain selectable even when an approach chart is overlaid on the main map. NOTE: If the chart for the loaded approach procedure is not overlaid on the map page with the Chart Overlay active, ensure the correct chart is selected on the dedicated Charts page. NOTE: If two GTN 7XX units are crossfilled, then the same type (ChartView or FlightCharts) and version (cycle number and effective dates) for the chart database must be installed on both units in order for the correct chart to be overlaid on the main map page. 190-01007-03-Final.indb 9 7/9/2015 2:07:31 PM
9-10Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex While viewing the Map Menu, touch the Charts Map Overlay key to toggle the view of the Charts overlay. Ownship Located on Chart OverlayChart Overlay Selected In The Map MenuFigure 9-8 Map Menu Charts Map Overlay "On" Selection190-01007-03-Final.indb 10 7/9/2015 2:07:31 PM
9-11190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.1.1.7 StormScope® (Optional)The WX-500 StormScope Weather Mapping Sensor is a passive weather avoidance system that detects electrical discharges associated with thunderstorms within a 200 NM radius of the aircraft. The StormScope measures relative bearing and distance of thunderstorm-related electrical activity and reports the information to the display. Stormscope and XM Lightning are mutually exclusive. NOTE: Refer to the WX-500 Pilot’s Guide for a detailed description of the WX-500 StormScope. 1. While viewing the Map Menu, touch the StormScope Map Overlay key to show the menu for selecting the StormScope radar weather data display mode (Cell, Strike, Off, or Clear Strikes). Select StormScope Data DisplayFigure 9-9 Map Menu StormScope Map Overlay Selection 2. StormScope data will be overlayed on the Map page when Cell or Strike is selected. See the Weather section for more details. Icon Shows StormScope Overlay Is ActiveFigure 9-10 Map Menu StormScope Map Overlay On Selection190-01007-03-Final.indb 11 7/9/2015 2:07:31 PM
9-12Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.1.1.8 Radar (Optional)The Radar setting set on the Weather Radar page, such as Tilt, Range, etc., will be used for the radar overlay on the Map page. NEXRAD/PRECIP and the Radar overlay may not be shown at the same time. While viewing the Map Menu, touch the Radar Map Overlay key to toggle the view of airborne Radar data. Scan LinePrecipitation ReturnsFigure 9-11 Map Menu Radar Map Overlay On Selection9.1.1.9 Traffic (Optional)The Traffic Map Overlay option selects whether Traffic data is shown on the Map page. A Traffic icon will indicate that the Traffic overlay has been selected. Traffic may or may not be shown depending on the other aircraft's location and equipment. See the Traffic section for more detail. While viewing the Map Menu, touch the Traffic Map Overlay key to toggle the view of Traffic data. Icon Shows Aircraft Is Receiving TIS Traffic From Ground Stations When A GDL 88 Is Connected (GTN software version 5.11 or earlier)Icon Shows Traffic Overlay Is ActiveNon-Threat Traffic Indication. Currently 1200 Ft Above And RisingFigure 9-12 Map Menu Traffic Map Overlay On Selection190-01007-03-Final.indb 12 7/9/2015 2:07:31 PM
9-13190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.1.2 Map SetupRangeTypeRestore DefaultsRoad DetailCity DetailState/Province NamesRiver/Lake DetailRestore DefaultsAirport RangeSafeTaxi DiagramsRunway ExtensionsIntersection RangeNDB RangeVOR RangeUser Waypoint RangeAirway RangeTFRsRestore DefaultsSmart AirspaceShow AirspacesClass B/TMA RangeClass C/TCA RangeClass D RangeRestricted RangeMOA (Military) RangeOther/ADIZ RangeRestore DefaultsWeather SourceCell MovementMETARCloud TopsEcho TopsLightningRestore DefaultsOrientationNorth Up AboveAuto ZoomAuto Zoom MinAuto Zoom MaxNav Range RingFuel Range RingFuel Reserve TimeTopo ScalePoint Obstacle RngWire Obstacle RngChart ColorRestore DefaultsFigure 9-13 Map Setup Functional Diagram190-01007-03-Final.indb 13 7/9/2015 2:07:32 PM
9-14Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexThe Map page is customized by selecting groups from the Map Menu. The Map Menu groups include choices for Map, Aviation, Land, Airspace, Traffic, and Weather groups depending on the installed equipment of a given aircraft. Each group has a list of options that vary with the group. 1. While viewing the Map page, touch the Menu key. Then, touch the Map Setup key. The Map Setup page will be displayed. Group OptionsMap Setup GroupGroup Option DetailsFigure 9-14 Map Setup Page 2. Touch the desired Map Setup Group tab (Map, Aviation, Airspace, Land, Traffic, or Weather) to display the set of group options. 3. Touch the desired group key. A list of options for the selected group will be shown. (i.e. Map - Orientation, North Up Above, Auto Zoom, etc.) Touch the Up or Down keys as needed to scroll through the list. 4. Touch the key for the selected option. 5. Touch the Restore Defaults key to return to the original default values for the selected option. 190-01007-03-Final.indb 14 7/9/2015 2:07:32 PM
9-15190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.1.2.1 MapThe Map option defines the behavior and display of information on the Map page such as: Orientation, North Up Above, Auto Zoom, Nav Range Ring, Topo Scale, Obstacle Range, and Restore Defaults. The default values are shown in bold type. Feature SelectionOrientation North Up, Track Up, Heading UpNorth Up Above Off, 10 NM, 15 NM, 25 NM, 40 NM, 50 NM, 75 NM, 100 NM, 150 NM, 250 NMAuto Zoom Off, OnAuto Zoom Min250 ft, 400 ft, 500 ft, 750 ft, 1000 ft, 1500 ft, 2500 ft, 0.5 NM, 0.75 NM, 1 NM, 1.5 NM, 2.5 NM, 4 NM, 5 NM, 7.5 NM, 10 NM, 15 NM, 25 NM, 40 NM, 50 NM, 75 NM, 100 NM, 150 NM, 250 NM, 400 NMAuto Zoom Max250 ft, 400 ft, 500 ft, 750 ft, 1000 ft, 1500 ft, 2500 ft, 0.5 NM, 0.75 NM, 1 NM, 1.5 NM, 2.5 NM, 4 NM, 5 NM, 7.5 NM, 10 NM, 15 NM, 25 NM, 40 NM, 50 NM, 75 NM, 100 NM, 150 NM, 250 NM, 400 NMNav Range Ring Off, On, EnhancedFuel Range Ring Off, OnFuel Reserve Time 30 Min, 45 Min, 60 Min, 90 MinTopo Scale Off, OnPoint Obstacle Range Off, 4 NM, 5 NM, 7.5 NM, 10 NM, 15 NMWire Obstacle Range Off, 1 NM, 1.5 NM, 2.5 NMChart Color Scheme Day, NightRestore Defaults Returns values to original factory settingsTable 9-1 Map Setup Map Options190-01007-03-Final.indb 15 7/9/2015 2:07:32 PM
9-16Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexMap OrientationThe Map Orientation selection sets the orientation of the Map page. Selections are North Up, Track Up, and Heading Up. A Map Orientation label is shown below the North indicator (reference to True North) in the top left corner of the Map page. Map OrientationFigure 9-15 Map Orientation LabelNorth Up AboveThe North Up Above option allows you to select the map range where at and above the selected value the Map Orientation will automatically change to North Up as a default. When the map range is 500 NM or more, the map orientation will automatically become North Up. Auto ZoomWith a valid flight plan, the Auto Zoom feature will automatically change the Map page range depending on the distance to the next waypoint in the flight plan. If enabled, it will also automatically zoom to the SafeTaxi zoom range when the aircraft is on the ground. Auto Zoom can be overridden at any time by manually zooming with the In and Out keys. The Auto Zoom Min selection sets the minimum range that the display will Zoom in. The Auto Zoom Max value sets the maximum range the display will Zoom out. Auto Zoom Active IndicationFigure 9-16 Auto Zoom Active IndicationAuto Zoom is re-enabled once one of the following conditions is met: • A waypoint is sequenced• The aircraft transitions from “on ground” to “in air”• A point is reached where the Auto Zoom range matches the manual override range (known as auto-sync) and will be noted as “Auto” above the map range value on the map page• Auto Zoom is toggled off and back on in the Map Setup page190-01007-03-Final.indb 16 7/9/2015 2:07:32 PM
9-17190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex NOTE: Rotorcraft use a Local Auto Zoom function where Auto Zoom will remain at the 1500 ft zoom scale until the rotorcraft is above 400 ft GSL or 40 kts. Auto Zoom MinSet the limit that the display will zoom in automatically. Selected Minimum Auto Zoom RangeFigure 9-17 Map Setup Minimum Auto Zoom RangeAuto Zoom MaxSet the limit that the display will zoom out automatically. Selected Maximum Auto Zoom RangeFigure 9-18 Map Setup Maximum Auto Zoom Range190-01007-03-Final.indb 17 7/9/2015 2:07:32 PM
9-18Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexNav Range RingWhen turned on, the Nav Range Ring option will show a ring with a compass rose oriented to magnetic north around your present position on the Map page. When selected ON, the Enhanced Range Ring function provides a second ring at 1/2 the distance of the primary ring to allow the pilot to acccurately judge distance to objects depicted on the map. Active Obstacle Overlay Types *Nav Range RingCurrent PositionNav Range Ring RangeFigure 9-19 Nav Range RingFuel Range Ring NOTE: This feature is available in software version 6.00 and later. When interfaced with a fuel computer, the GTN can display a Fuel Range Ring which shows an estimate of the remaining flight distance at the current fuel consumption rate and groundspeed. If either fuel quantity or fuel flow sensor data is not received, the GTN will use the Fuel on Board or Fuel Flow values on the Utilities – Fuel Planning page. If both fuel quantity and fuel flow are not received by the GTN, the Fuel Range Ring will be removed. A dashed green circle indicates the selected Range to Reserve Fuel. A solid yellow circle indicates the Total Endurance Range. 190-01007-03-Final.indb 18 7/9/2015 2:07:32 PM
9-19190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexRange To Reserve FuelTotal Endurance TimeTime To Reserve FuelTotal Endurance RangeFigure 9-20 Fuel Range RingTOPO ScaleThe Topo Scale option selects whether the elevation scale for topographical features on the Map page is displayed. The scale will be located on the left side of the display. Figure 9-21 Map Page Topo Scale190-01007-03-Final.indb 19 7/9/2015 2:07:32 PM
9-20Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexPoint Obstacle RangeThe Point Obstacle Range option selects whether the Point Obstacle Data is shown on the Map page at and below the selected Point Obstacle range. Map ranges above this value will not show the Point Obstacle Data. An obstacle with an asterisk indicates a group of the same obstacle type. Unlighted Obstacle (Height is less than 1000 ft AGL)Lighted Obstacle (Height is less than 1000 ft AGL)Unlighted Obstacle (Height is greater than 1000 ft AGL)Lighted Obstacle (Height is greater than 1000 ft AGL) Table 9-2 Navigation Map Point Obstacle Icons by ElevationTower Windmill Windmill in Group Power LineTable 9-3 Obstacle Icon TypesColor DescriptionNone Lines are removed when they are more than 2000 ft below the aircraft. White Lines are white when they are within 2000 ft below the aircraft. Amber Lines are amber when they are within 1000 ft below the aircraft. Red Lines are red when they are within 100 ft below or above the altitude of the airplane. Table 9-4 Fixed Wing Color Scheme for Obstacles and WiresColor DescriptionNone Lines are removed when they are more than 500 ft below the rotorcraft. White Lines are white when they are within 500 ft below the rotorcraft. Amber Lines are amber when they are within 250 ft below the rotorcraft. Red Lines are red when they are at or above the altitude of the rotorcraft. Table 9-5 Rotorcraft Color Scheme for Obstacles and Wires190-01007-03-Final.indb 20 7/9/2015 2:07:33 PM
9-21190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexGrouped obstacles are shown with an asterisk. The color of the asterisks is tied to the relative altitude of the highest obstacle in the group, not other obstacles within that group. Obstacles are grouped when they would otherwise overlap. 1. While viewing the Map function, touch the Menu key. 2. Touch the Map Setup key. 3. Under the Map tab touch the Point Obstacle Range key and select the maximum range where obstacles will be displayed. Lighted ObstacleCurrent PositionActive Obstacle Overlay Types *Grouped ObstaclesUnlighted ObstacleFigure 9-22 Navigation Map Point Obstacles * The icon on the left shows that the point obstacle overlay is active. The icon on the right shows that the wire obstacle overlay is active. These icons are available in software version 5.12 or later. 4. Touch an obstacle on the map and the elevation will be shown. If there are nearby or overlayed objects (obstacle, airspace, airport, etc), touch the Next key to step through the nearby objects. Touch the Back key to return to the normal map view. 190-01007-03-Final.indb 21 7/9/2015 2:07:33 PM
9-22Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexSelected ObstacleObstacle Location DetailTouch to Step to the Next Nearby ObstacleSelected Obstacle Info and TypeFigure 9-23 Point Obstacle DetailWire Obstacle RangeThe Wire Obstacle Range option selects whether the power lines are shown on the Map page at and below the selected Wire Obstacle range. Map ranges above this value will not show the Wire Obstacle Data. NOTE: This feature is available in software version 5.10 and later and requires the use of obstacle databases that contain wire obstacle data. Selected ObstacleDetail at Cursor PointHTAWS AlertWire ObstacleDetail About the Selected ObstacleGrouped ObstaclesFigure 9-24 Wire Obstacles190-01007-03-Final.indb 22 7/9/2015 2:07:33 PM
9-23190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexChart Color SchemeThe Chart Color Scheme setting changes the day and night view of the Chart Overlay colors on the Map page. Figure 9-25 Chart Color Scheme SettingsRestore DefaultsReturns values to the original factory settings. 9.1.2.2 AviationThe Aviation group selection from the Map Setup Page Menu allows you to customize the display of Active Flight Plan, Active Flight Plan Waypoints, Airport size range, SafeTaxi information, Runway Extensions, Intersection/NDB locations, VOR locations, Airspace Detail, and TFR icons on the Map page. The feature will be shown at map ranges of the selected value and lower. The options for each feature are shown in the following table. The default values are shown in bold type. Feature SelectionAirport Range Off, 7.5 NM, 10 NM, 15 NM, 25 NM, 40 NM, 50 NM, 75 NM, 100 NM, 150 NMHeliports (Optional) Off, OnSafeTaxi Diagrams Off, 1000 ft, 1500 ft, 2500 ft, 0.5 NM, 0.75 NM, 1 NM, 1.5 NMRunway Extensions Off, 1 NM, 1.5 NM, 2.5 NM, 4 NM, 5 NMIntersection Range Off, 0.75 NM, 1 NM, 1.5 NM, 2.5 NM, 4 NM, 5 NM, 7.5 NM, 10 NMNDB Range Off, 0.75 NM, 1 NM, 1.5 NM, 2.5 NM, 4 NM, 5 NM, 7.5 NM, 10 NM190-01007-03-Final.indb 23 7/9/2015 2:07:34 PM
9-24Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexFeature SelectionVOR Range Off, 10 NM, 15 NM, 25 NM, 40 NM, 50 NM, 75 NM, 100 NMUser Wpt Range Off, 0.75 NM, 1 NM, 1.5 NM, 2.5 NM, 4 NM, 5 NM, 7.5 NM, 10 NM, 15 NM, 25 NM, 40 NM, 50 NM, 75 NM, 100 NMAirway Range 2.5 NM, 4 NM, 5 NM, 7.5 NM, 10 NM, 15 NM, 25 NMTFR Off, OnRestore Defaults Returns values to original factory settingsTable 9-6 Map Setup Aviation Options NOTE: The term “intersection range” means any GPS waypoint included in the navigation database, and includes waypoints that may not be intersections of two VOR radials. Airport Size Size Criteria Display CriteriaSmallLongest runway length is less than 5000 feet, unless it has a tower frequency, in which case it is a Medium Airport. Small airports and heliports are displayed on the map when the Map Range is less than or equal to 1/4 times the Airport Range Setting. MediumLongest runway length is less than 8100 feet but greater than or equal to 5000 feet or less than 8100 feet and has a tower frequency. Medium airports are displayed on the map when the Map Range is less than or equal to 1/2 times the Airport Range Setting. LargeLongest runway length is greater than or equal to 8100 feet. Large airports are displayed on the map when the Map Range is less than or equal to the Airport Range Setting. Table 9-7 Airport Display Range Setting NOTE: The Airport Range Setting of "Off" means airports are never displayed. Heliports are displayed on the map page if the Heliport Display Setting is "On" and the Map Range is less than or equal to 1/4 times the Airport Range Setting. 190-01007-03-Final.indb 24 7/9/2015 2:07:34 PM
9-25190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.1.2.3 LandThe Land Data option selects whether detailed land features, such as Freeways, National Highways, Local Roads, Cities, States/Provinces, and Rivers/Lakes are displayed. Topo features, traffic, terrain, and obstacles will still be displayed, even with Land Data turned off. The options for each feature are shown in the following table. The default values are shown in bold type. Feature SelectionRoad Detail None, Least, Less, Normal, More, MostCity Detail None, Least, Less, Normal, More, MostState/Province Names Off, OnRiver/Lake Detail None, Least, Less, Normal, More, MostRestore Defaults Returns values to original factory settingsTable 9-8 Map Setup Land Options9.1.2.4 AirspaceThe Airspace viewing range options select whether the Airspaces are shown on the Map and at and below the selected map ranges. The Smart Airspaces selection filters airspaces to show the ones appropriate for your altitude. Feature SelectionAirspace Label Range Off, 7.5 NM, 10 NM, 15 NM, 25 NM, 40 NM, 50 NMSmart Airspace Off, OnShow Airspaces All, Below 18000 ft, Below 15000 ft, Below 12000 ft, Below 9000 ft, Below 6000 ft, Below 3000 ftClass B/TMA Range Off, 1 NM, 1.5 NM, 2.5 NM, 4 NM, 5 NMClass C/TCA Range Off, 0.75 NM, 1 NM, 1.5 NM, 2.5 NM, 4 NM, 5 NM, 7.5 NM, 10 NMClass D Range Off, 0.75 NM, 1 NM, 1.5 NM, 2.5 NM, 4 NM, 5 NM, 7.5 NM, 10 NMRestricted Range Off, 10 NM, 15 NM, 25 NM, 40 NM, 50 NM, 75 NM, 100 NMMOA (Military) RangeOff, 0.75 NM, 1 NM, 1.5 NM, 2.5 NM, 4 NM, 5 NM, 7.5 NM, 10 NM, 15 NM, 25 NM, 40 NM, 50 NM, 75 NM, 100 NMOther/ADIZ Range None, Least, Less, Normal, More, MostRestore Defaults Returns values to original factory settingsTable 9-9 Map Setup Airspace Options190-01007-03-Final.indb 25 7/9/2015 2:07:34 PM
9-26Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexAirspace Labels NOTE: This feature is available in software version 5.10 and later when configured by the installer. The Airspace Label feature shows the airspace altitude limits within the selected range. Airspace Labels - OnFigure 9-26 Display of Airspace LabelsSmart Airspaces: Garmin’s Smart Airspace™ feature aids visual clarity on-screen by de-emphasizing airspace that’s well above or below the aircraft’s current altitude. The vertical separation is 1,000 feet at sea level and the vertical separation will gradually increase to 2,000 feet until the aircraft reaches 10,000 feet. Anything above 10,000 feet keeps the 2,000 feet vertical separation. NOTE: Smart Airspace only changes the depiction of the airspace on the moving map display. It does not alter the Airspace Alerts that can be set on the System-Alerts portion of the system. Smart Airspaces - OnSmart Airspaces - OffFigure 9-27 Display of Smart Airspaces (Airspace Borders Grayed)190-01007-03-Final.indb 26 7/9/2015 2:07:34 PM
9-27190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexTo control the display of European airway airspaces: 1. While viewing the Map Setup Airspaces option, touch the Other/ADIZ Range key and select a value. 2. Select Off for the Other/ADIZ Range to turn off the display of airway airspaces. Airway Airspaces - OnAirway Airspaces - OnAirway Airspaces - OffFigure 9-28 Selecting the Display of European Airway Airspaces9.1.2.5 Traffic (Optional)The Traffic group selection from the Map Setup Page Menu allows you to customize the display of traffic on the Map page. The Traffic function requires the installation of the appropriate traffic device. Only one traffic source can be configured for the GTN and this traffic source will be overlaid on the main map. Coverage follows the airplane. In the Navigation Map page setup you can select the maximum range at which traffic symbols are shown. Once outside of the selected range, traffic will be decluttered. The default values are shown in bold type. Traffic Selection Display ResultRange 1 NM, 1.5 NM, 2.5 NM, 4 NM, 5 NM, 7.5 NM, 10 NM, 15 NM, 25 NMTraffic All Traffic, Alerts & Advisories, Alerts OnlyRestore Defaults Returns values to original factory settingsTable 9-10 Map Page Traffic Display Options190-01007-03-Final.indb 27 7/9/2015 2:07:35 PM
9-28Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.1.2.6 Weather (Optional)The Weather group selection from the Map Setup Page Menu allows you to customize the overlay of the available weather information on the Map page. Weather is an optional feature that requires an external weather source, which must be selected to allow the overlay. Feature SelectionWeather Source SiriusXM, Connext, or FIS-BCell Movement Off, OnMETAR Off, OnCloud Tops Off, OnEcho Tops Off, OnLightning Off, OnRestore Defaults Returns values to original factory settingsTable 9-11 Map Setup SiriusXM Weather Options NOTE: Map overlay keys may remain available even if the information necessary for the overlay is not available. For example: the Radar overlay key is available even if the radar is turned off. Feature SelectionWeather Source SiriusXM, Connext, or FIS-BMETAR Off, OnIR Satellite Off, OnLightning Off, OnRestore Defaults Returns values to original factory settingsConnext Settings Selectable Connext SettingsTable 9-12 Map Setup Connext Weather OptionsFeature SelectionWeather Source SiriusXM, Connext, or FIS-BMETAR Off, OnRestore Defaults Returns values to original factory settingsTable 9-13 Map Setup FIS-B Weather Options190-01007-03-Final.indb 28 7/9/2015 2:07:35 PM
9-29190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.1.3 Change User FieldsThe Change User Fields selection allows you to configure the Data, Function, and Page field type shown in each of the four corners of the Map page. The information shown in each field may be selected from a list after Change User Fields is selected. 1. While viewing the Map page, touch the Menu key. 2. From the Map Menu screen, touch the Change User Fields key. Touch To Select Data Field(TRK Currently Shown)Touch To Select Data Field(DIS Currently Shown)Touch To Cancel Any ChangesFigure 9-29 Map Data Fields Selection NOTE: Map Data Field Types that use the term "Destination" refer to the missed approach point (if an approach is loaded) or the final airport in the flight plan. NOTE: In software version 5.13 and earlier, ETE to Destination is not available when a procedure is loaded and there are waypoints in the Enroute section of the flightplan. 190-01007-03-Final.indb 29 7/9/2015 2:07:35 PM
9-30Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex 3. Touch the corner data field key you want to select. Touch the Data, Function, or Page keys to select the User Field type. A list of information types will be displayed. Field Type List. Touch To Select Data FieldSelected Field TypeSlider Indicates More Selections Available. Press Finger and Slide To View More Selections. Touch To Select Data, Function, or PageFigure 9-30 Map Data Field Type Selections 4. Touch the Up or Down keys or touch the display and drag your finger to scroll through the list. Touch the desired item to select it or touch the Back key to cancel selection. 190-01007-03-Final.indb 30 7/9/2015 2:07:35 PM
9-31190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexMap Data Field TypeACTV WPT - Active Waypoint MSA - Minimum Safe AltitudeB/D APT - BRG/DIS from Dest APT 1OAT (static) - Static Air TemperatureBRG - Bearing to Current Waypoint OAT (total) - Total Air TemperatureDIS - Distance to Current Waypoint RAD ALT - Radar AltimeterDIS to Dest - Distance to Destination 2Time - Current TimeDTK - Desired Track Time to TOD - Time to Top of DescentESA - Enroute Safe Altitude TKE - Track Angle ErrorETA - Estimated Time of Arrival TRK - TrackETA at Dest - ETA at Destination Trip Timer - Timer DisplayETE - Estimated Time Enroute VOR/LOC - Tuned VOR/LOC InfoETE to Dest - ETE to Destination VSR - Vertical Speed RequiredFuel Flow - Total Fuel Flow Wind - Wind Speed and DirectionGS - GPS Ground Speed XTK - Cross Track ErrorGSL - GPS Altitude OFF - Do Not Display Data FieldGeneric Timer - Timer DisplayTable 9-14 Map Data Field Types of Information Note 1: B/D APT is the straight line distance. Note 2: Dist to DEST is the distance along the flight plan. Function Field TypeCDI - Course Deviation Indicator Passenger Address - PA ToggleFlap Override - Flap Override 1Playback - Play Last RecordingGPWS Inhibit - GPWS Inhibit 1TAWS Inhibit - TAWS InhibitG/S Inhibit - G/S Inhibit 1Gen Timer - Generic Timer ControlHTAWS RP Mode - HTAWS RP Mode 2WX RDR Controls - Weather Radar ControlsOBS/Suspend/Unsuspend Button OFF - Do Not Display Data FieldOn Scene - "On Scene" Mode ToggleTable 9-15 Map Function Field Types of Information Note 1: With TAWS-A enabled Note 2: With HTAWS enabled190-01007-03-Final.indb 31 7/9/2015 2:07:35 PM
9-32Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexMap Page Field TypeCharts - Charts Page Fuel PLAN - Fuel Planning PageFlight Plan - Flight Plan Page SCHED MSG - Scheduled MessagesMap - Map Page Trip PLAN - Trip Planning PageNearest - Nearest Page VCALC - VCALC PageNEAR APT - Nearest Airport Page User FREQ - User FrequenciesPROC - Procedures Page WPT INFO - Waypoint InformationApproach - Approach Page Weather - Weather PageArrival - Arrival Page CNXT WX - Connext WX PageDeparture - Departure Page FIS-B WX - FIS-B Weather PageServices - Services Page Stormscope - Stormscope PageTraffic - Traffic Page WX Radar - Weather Radar PageTerrain - Terrain Page SiriusXM WX - Sirius XM WX PageUtilities - Utilities Page OFF - Do Not Display Page FieldChecklist - Checklist PageTable 9-16 Map Page Field Types of Information9.1.4 Map DetailThe Map Detail feature allows four levels of decluttering to remove map information. The declutter level is displayed in the DCLTR key. There are four levels of decluttering. Level 0 shows the most detail and level 3 shows the least detail. 0123Figure 9-31 Map Detail Levels190-01007-03-Final.indb 32 7/9/2015 2:07:35 PM
9-33190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex 1. While viewing the Map page, touch the Menu key. 2. While viewing the Map Menu, touch the Map Detail scale and slide your finger to adjust the level. Features marked with a • are shown at the indicated Map Detail Level. Feature 0123 Feature 0123River/Lake Names • TRSA • •Land/Country Text • ADIZ • •Large City • Alert Areas • •Medium City • Caution Areas • •Small City • Danger Areas • •Small Town • Warning Areas • •Freeways • Large Airports • • •Highways • Medium Airports • • •Roads • Restricted Areas • • •Railroads • Prohibited Areas • • •Political Boundaries • MOAs • • •User Waypoints • • Runway Labels • • •VORs • •Lightning Strike Data•••NDBs • • NEXRAD Data • • •Intersections • • Traffic Symbols • • •Class B Airspace • • Traffic Labels • • •Class C Airspace • • Water Detail ••••Class D Airspace • • Active FPL Legs ••••Tower • • Airways ••••Table 9-17 Features Shown at Each Map Detail Level190-01007-03-Final.indb 33 7/9/2015 2:07:35 PM
9-34Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.2 Map PanningIn the Map Page function, panning allows you to move the map beyond its current limits without adjusting the map scale. The panning function is selected by simply touching the Map display. The In and Out keys at the lower right corner of the page control the map range. Touching the display momentarily switches the display to Map Pan Mode. While in Map Pan Mode, touch the display gently and drag your finger to pan around the map. 1. Touch the Map page display. Info On Selected ItemPan Mode Annunciation and Bearing and Distance To The Map Pointer From Present PositionTouch To Edit FPL On The DisplayAircraft Present PositionTouch To Step To Items Near The Map PointerMap Pointer LocationSelected ItemFigure 9-32 Map Panning With Airspace Highlighted NOTE: It is possible that multiple airspaces can be stacked vertically and be difficult to visually identify them. Touching the Next key will step through the airpaces. 2. If you touch an item on the display (waypoint, airspace, obstacle) there may be other items very close that are difficult to see at a given zoom level. Touch the Next key to annunciate and highlight the next item. Each touch of the Next key steps to another item near the Map Pointer. 190-01007-03-Final.indb 34 7/9/2015 2:07:36 PM
9-35190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexNext Nearest Item HighlightedInfo On Selected ItemPan Mode Annunciation and Bearing and Distance To The Cursor From Present Position And Elevation At The CursorTouch To Edit FPL On The DisplayAircraft Present PositionTouch To Step To Items Near The CursorCursor LocationFigure 9-33 Map Panning With Next Airspace Shown 3. Touch the Airspace Info (Item) key for more information about the selected item. Touch the Back key to return to the Map Panning display. Figure 9-34 Map Panning Selected Item Information190-01007-03-Final.indb 35 7/9/2015 2:07:36 PM
9-36Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex 4. While pressing your finger gently against the display, drag your finger across the display to scroll the display in the direction of your finger movement. The Map Pointer cross hair location is based on where your finger touches the display, but after dragging your finger the Map Pointer will be centered on the map when your finger is lifted from the display. Pan Mode Annunciation Coordinates Of Map PointerMap PointerFigure 9-35 Map Panning With Map Pointer NOTE: Pressing the Direct-To key will use the Map Pointer location as the destination. 5. Touch the Back key to return to the normal map display. 190-01007-03-Final.indb 36 7/9/2015 2:07:36 PM
9-37190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.3 Map ControlsWhile in the Map page function, several controls are available to manage the view and display of information. The In and Out keys at the lower right corner of the page control the map range. Touching the display momentarily switches the display to Map Pan Mode. While in any of the Map function pages, touching the display starts Pan Mode. Options are available to Create a waypoint at the Map Pointer position and to Graphically Edit Flight Plan. 9.3.1 Pan Map ModeThe Pan Map mode allows you to move the map display to view the surrounding area. 1. Touch the Map page display. 2. See the description in the Map Panning section for details of using this feature. Touch the Back key to return to the normal Map display. 9.3.2 Create WaypointThe Create Waypoint function will create a User Waypoint at the Map Pointer location when that location is not an already named object, such as an airport or airspace. 1. In Pan Mode, touch the Create Waypoint key. 2. Follow the directions in the Waypoint Info section for Creating User Waypoints. Figure 9-36 Create User Waypoint While Map Panning190-01007-03-Final.indb 37 7/9/2015 2:07:36 PM
9-38Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.3.3 Graphically Edit Flight Plan ModeThe Edit Flight Plan Mode allows making quick changes to the active flight plan directly on the display. The process is simply touching the display to start Map Pan Mode, touching the Graphically Edit FPL key, dragging the desired leg to a new waypoint or airway, and touching the Done key. At any point, a step may be removed by touching the Undo key or the whole process ended by touching the Cancel key. The Undo key will remove up to nine steps. 9.3.3.1 Adding a Waypoint Within an Existing Flight Plan 1. Touch the Map page display. The Map Mode selection keys will appear. Touch the Graphically Edit FPL key. Active Flight PlanTouch To Return To The Map DisplayMap Pointer Where Display Was TouchedTouch Edit Flight Plan Key To Change FPLFigure 9-37 Edit Flight Plan Mode 2. Touch and hold the desired leg of the flight plan. Active Flight Plan LegTouch To Cancel Changes And Return To Map DisplayCurrent Active FPL WaypointsIntended New WaypointFigure 9-38 Select Leg of Flight Plan to Change190-01007-03-Final.indb 38 7/9/2015 2:07:36 PM
9-39190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex 3. Drag the flight plan leg to a new waypoint, or airway, to add a waypoint, or airway, to the active flight plan. The flight plan leg being edited will turn cyan. New FPL WaypointActive Flight Plan LegTouch To Cancel Changes And Return To Map DisplayFigure 9-39 Drag Selected Leg of Flight Plan to New Waypoint 4. Touch the Done key. The aircraft will now navigate according to the new flight plan. New FPL WaypointActive Flight Plan LegTouch To Cancel EditingNew Active FPLTouch To Accept Changes To FPLTouch To Undo Last StepFigure 9-40 Completed Flight Plan with New Waypoint NOTE: Parallel track will be cancelled when graphically editing a flight plan. NOTE: It is not possible to graphically add an intermediate waypoint between the current position and a direct-to waypoint unless that waypoint is in the flight plan. Garmin recommends deleting any flight plan prior to graphically editing a direct to waypoint. 190-01007-03-Final.indb 39 7/9/2015 2:07:37 PM
9-40Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.3.3.2 Adding a Waypoint to the End of an Existing Flight Plan 1. Touch the Map page display. The Map Mode selection keys will appear. Touch the Graphically Edit FPL key. 2. Touch a waypoint that you want to add to the end of the flight plan. 3. Touch the Done key to accept the changes and return to the Map page. 9.3.3.3 Removing a Waypoint from an Existing Flight Plan 1. Touch the Map page display. The Map Mode selection keys will appear. Touch the Graphically Edit FPL key. 2. Touch a waypoint, or airway, on the flight plan that you want to remove. 3. Drag the flight plan line away from the waypoint, or airway, and release the line. The waypoint, or airway, will be removed from the flight plan. 4. Touch the Done key to accept the changes and return to the Map page. 9.3.3.4 Creating a Flight Plan Without an Existing Flight Plan 1. Touch the Map page display. The Map Mode selection keys will appear. Touch the Graphically Edit FPL key. 2. Touch a waypoint on the map to set the first waypoint in the flight plan. If there are several nearby waypoints, touch the desired waypoint to select it. Touch Desired WaypointCluster Of Nearby Multiple WaypointsFigure 9-41 Select the Desired Waypoint From Multiple Waypoints190-01007-03-Final.indb 40 7/9/2015 2:07:37 PM
9-41190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexNew FPL WaypointTouch To Undo Last StepFigure 9-42 Start New Flight Plan with Origin Waypoint 3. Touch a waypoint, or airway, on the map for the next waypoint, or airway, in the flight plan. Continue adding waypoints, or airways, as needed. New FPL WaypointTouch To Undo Last StepActive Flight Plan LegTouch To Cancel EditingNew Active FPLTouch To Accept Changes To FPLFigure 9-43 Add New Waypoint to Flight Plan 4. Touch the Done key to accept the changes and return to the Map page. 190-01007-03-Final.indb 41 7/9/2015 2:07:37 PM
9-42Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.4 CDI (GTN 750 only)The GTN 750's CDI key is used to select data that is sent from the GPS or VLOC receiver to the external CDI (or HSI). When the external CDI (or HSI) is connected to the GPS receiver, “GPS” appears below the CDI key in the annunciation bar. When the external CDI (or HSI) is being driven by the VLOC receiver, “VLOC” appears instead. NOTE: The VLOC receiver must be selected for display on the external CDI/HSI for approaches which are not approved for GPS. See the ILS example in the Procedures section for more information. NOTE: GPS phase of flight annunciations (LPV, ENR, etc.) are not applicable to the external CDI (or HSI) when VLOC is active. NOTE: The internal on-screen CDI information is based on GPS data and cannot be used for primary navigation. NOTE: If the unit is not configured for a CDI key, then the “activate GPS missed approach” will only resume automatic waypoint sequencing. The user must switch to GPS navigation, if desired, by using their external source selection method (this is typical an EFIS system). 1. The navigation source is annunciated under the CDI key. Touch CDI Key To Toggle Navigation SourceNavigation Source AnnunciationFigure 9-44 Navigation Source Selection 2. Touch the CDI key to toggle between sources. 190-01007-03-Final.indb 42 7/9/2015 2:07:37 PM
9-43190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.5 OBSThe OBS key is used to select manual or automatic sequencing of waypoints. Touching this key selects OBS mode, which retains the current “active to” waypoint as your navigation reference even after passing the waypoint (i.e., prevents sequencing to the next waypoint). Touching the OBS key again returns to normal operation, with automatic sequencing of waypoints. Whenever OBS mode is selected, you may set the desired course To/From a waypoint using the pop-up window on the GTN 7XX or with the external OBS selector on your HSI or CDI. For leg types that do not support OBS, this key will be shown as a SUSP key. This key will then also function as an Unsuspend key for legs that auto-suspend, such as holds, missed approaches, etc. NOTE: In dual GTN installations with crossfill on, the OBS course will only be updated real time on the GTN that is receiving the new OBS course. The course will be transferred to the other GTN when OBS is exited. 1. Touch the OBS key to enable the OBS function. 2. Enter the desired OBS heading using the keypad and touch Enter. 3. The OBS heading will be shown in the flight plan annunciation above the CDI in the lower portion of the display. The OBS function annunciation will show. Touch the OBS Key To Enable OBS FunctionOBS Function AnnunciationOBS HeadingActive FPL LegOwnship PositionDestination WptNext FPL LegRunway ExtensionFigure 9-45 OBS Course Selection190-01007-03-Final.indb 43 7/9/2015 2:07:37 PM
9-44Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex9.6 Map SymbolsVarious symbols are used to distinguish between waypoint types. The identifiers for any on-screen waypoints can also be displayed. Special-use and controlled airspace boundaries appear on the map, showing the individual sectors in the case of Class B, Class C, or Class D airspace. The following symbols are used to depict the various airports and navaids on the Map Page: Symbol Description Airport with hard surface runway(s); Serviced, Primary runway shownAirport with hard surface runway(s); Non-Serviced, Primary runway shownAirport with soft surface runway(s) only, ServicedAirport with soft surface runway(s) only, Non-ServicedUnknown AirportRestricted (Private) AirfieldIntersectionVORVORTACVOR/DMETACANDMENDBLocator Outer MarkerHeliportTable 9-18 Map Symbols190-01007-03-Final.indb 44 7/9/2015 2:07:38 PM
10-1190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex10 TRAFFICThe Traffic function displays available traffic information depending on your installed equipment to assist in situational awareness. The features and operation depend on the capabilities and options of each type of traffic system. NOTE: The reference point for the ownship is the nose of the ownship aircraft symbol (either miniature aircraft or triangle). The reference point for all traffic icons is the center of the depicted traffic. 1. From the Home page, touch the Traffic key. 2. Use the active areas on the display and the Menu options to set up the Traffic display. 10.1 Traffic Pop-UpWhen the GTN 7XX is displaying any page (other than the Traffic page) and a traffic alert becomes active, the Traffic Warning pop-up will be displayed. NOTE: The traffic pop-up will not appear when your aircraft is on the ground. 1. The traffic pop-up will appear on pages other than the Traffic page when a traffic alert occurs. Traffic Alert AnnunciationTouch To Go To Traffic PageTouch To Close Pop-UpTraffic Alert AnnunciationOwnship PositionTraffic LocationFigure 10-1 Traffic Pop-Up On the Map Page 2. Touch the Go to Traffic key to view the Traffic page. OR 3. Touch the Close key to close the pop-up. The pop-up will return if the traffic alert persists. 190-01007-03-Final.indb 1 7/9/2015 2:07:38 PM
10-2Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.2 Traffic TestThe Traffic Test function is only available on some traffic systems. The aircraft must be on the ground and Traffic Status must be in Standby. 1. Touch the Test key to activate the test function in the Traffic equipment. Test Traffic StatusTouch For Traffic Test While In Standby Traffic StatusFigure 10-2 Traffic Test Mode 2. The unit will return to normal operation mode after the test process is successfully completed. 190-01007-03-Final.indb 2 7/9/2015 2:07:38 PM
10-3190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.3 Traffic Information Service (TIS) (Optional) WARNING: The Traffic Information Service (TIS) is intended for advisory use only. TIS is intended to help the pilot locate traffic visually. It is the responsibility of the pilot to see and maneuver to avoid traffic. NOTE: TIS is available only when the aircraft is within the service volume of a TIS-capable terminal radar site. Aircraft without an operating transponder are invisible to both Traffic Advisory Systems (TAS) and TIS. Aircraft without altitude reporting capability are shown without altitude separation data or climb/descent indication. NOTE: TIS and Traffic Advisory System (TAS) may not both be configured at the same time. NOTE: GDL 88 equipped aircraft only: When the radio tower symbol is crossed out, the aircraft is not a participant in the TIS-B system – i. e. not visible to other TIS-B clients. The GDL 88 will, however, continue to receive available TIS-B and FIS-B ground station up-links and continue to display TIS-B and FIS-B data along with available ADS-B and ADS-R data. NOTE: Except for GDL 88 equipped aircraft, TIS, and Traffic Advisory System (TAS) may not both be displayed at the same time. NOTE: More information is available about the GDL 88 in the "Garmin GDL 88 ADS-B Transceiver Pilot’s Guide." Traffic Information Service (TIS) is designed to help in detection and avoidance of other aircraft. TIS uses the Mode S transponder for the traffic data link. TIS receives traffic information from ground stations, and is updated every five seconds. The GTN 7XX displays up to eight traffic targets within a 7.5 NM radius, from 3000 feet below to 3500 feet above the requesting aircraft. 7.0 NM 3,500 ft3,000 ftFigure 10-3 TIS Coverage Volume (not to scale)190-01007-03-Final.indb 3 7/9/2015 2:07:39 PM
10-4Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.3.1 TIS SymbologyTraffic is displayed according to TCAS symbology using three different symbols. TIS Symbol DescriptionNon-Threat TrafficTraffic Advisory (TA)Traffic Advisory Off ScaleTable 10-1 TIS Traffic SymbolsTraffic Advisories (TA) alert the crew to intruding aircraft. When traffic meets the advisory criteria for the TA, a solid yellow circle symbol is generated. A Non-threat Advisory, shown as an open white diamond, indicates that an intruding aircraft is at greater than ±1200 feet relative altitude or the distance is beyond five NM. A Traffic Advisory that is beyond the selected display range is indicated by a half TA symbol at the edge of the screen at the relative bearing of the intruder. TIS also provides a vector line showing the direction in which the traffic is moving, to the nearest 45°. Traffic information for which TIS is unable to determine the bearing (non-bearing traffic) is displayed in the center of the Traffic Page or in a banner on maps other than the Traffic Map Page on which traffic can be displayed. The altitude difference between the requesting aircraft and other intruder aircraft is displayed above/below the traffic symbol in hundreds of feet. If the other aircraft is above the requesting aircraft, the altitude separation appears above the traffic symbol with a "+" sign; if below, the altitude separation appears below. Altitude trend is displayed as an up/down arrow (for speeds greater than 500 fpm in either direction) to the right of the target symbol. Traffic symbols for aircraft without altitude reporting capability appear without altitude separation or climb/descent information. Always remember that TIS cannot alert you to the presence of aircraft that are not equipped with transponders, nor can it alert you to aircraft that may be nearby, but obscured from the ground surveillance radar by interfering terrain. 190-01007-03-Final.indb 4 7/9/2015 2:07:39 PM
10-5190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.3.2 Traffic PageThe Traffic Map Page is configured to show surrounding TIS traffic data in relation to the aircraft’s current position and altitude, without clutter from the basemap. Aircraft orientation on this map is always heading up unless there is no valid heading. The traffic mode is annunciated in the upper left corner of the Traffic Map Page. When the aircraft is on the ground, TIS automatically enters Standby Mode. Once the aircraft is airborne, TIS switches from Standby to Operating Mode and the GTN 7XX begins to display traffic information. OperateStandbyTRF StatusAltitude FilterNormalAboveBelowUnrestrictedFigure 10-4 Traffic Page Functional DiagramHeading AnnunciationRange RingsOwnship PositionNon-Threat TrafficAltitude FilterTraffic Status Key (Operate/Standby) Range Ring RadiusProximity Advisory, 1200 ft Above and ClimbingTraffic Direction Of TravelFigure 10-5 Traffic Page190-01007-03-Final.indb 5 7/9/2015 2:07:39 PM
10-6Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.3.3 Displaying Traffic on the Traffic Page 1. From the Home page, touch the Traffic key. 2. Confirm TIS is in Operating Mode. 3. Touch the Traffic Status key to toggle between Operate and Standby mode. 10.3.4 Altitude Display 1. While viewing the Traffic page, touch the Operate key to begin displaying traffic. “Operate” is displayed in the Traffic Status field. 2. The Altitude Filter limits the traffic displayed to the Below, Normal, Above or Unrestricted altitude block as listed in the “Displayed Traffic Range” table. The filter altitudes are relative to ownship altitude. Touch the Altitude Filter key to change the altitude filter value. Select the desired altitude filter by touching the BELOW, NORMAL, ABOVE, or UNRESTRICTED keys. The selection is displayed in the Altitude mode field. Selected Altitude FilterFigure 10-6 Traffic Altitude Filter Page190-01007-03-Final.indb 6 7/9/2015 2:07:39 PM
10-7190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexAltitude Mode Displayed Traffic RangeBelow -9900 ft to 2700 ftNormal -2700 ft to 2700 ftAbove -2700 ft to 9900 ftUnrestricted All Traffic ShownTable 10-2 Displayed Traffic Range10.3.5 TIS Limitations NOTE: This section on TIS Limitations is not comprehensive. Garmin recommends the user review the TIS Limitations section of the Aeronautical Information Manual, Section 1-3-5. TIS is NOT intended to be used as a collision avoidance system and does not relieve the pilot of responsibility to “see and avoid” other aircraft. TIS should not be used for avoidance maneuvers during IMC or other times when there is no visual contact with the intruder aircraft. TIS is intended only to assist in visual acquisition of other aircraft in VMC. No recommended avoidance maneuvers are provided for, nor authorized, as a direct result of a TIS intruder display or TIS advisory. While TIS is a useful aid to visual traffic avoidance, it has some system limitations that must be fully understood to ensure proper use. Many of these limitations are inherent in secondary radar surveillance. In other words, the information provided by TIS will be no better than that provided to ATC. TIS will only display aircraft with operating transponders installed. TIS relies on surveillance of the Mode S radar, which is a “secondary surveillance” radar similar to the Air Traffic Control Radar Beacon System (ATCRBS). TIS operation may be intermittent during turns or other maneuvering. TIS is dependent on two-way, “line-of-sight” communication between the aircraft and the Mode S radar. Whenever the structure of the client aircraft comes between the transponder antenna (usually located on the underside of the aircraft) and the ground-based radar antenna, the signal may be temporarily interrupted. Other limitations and anomalies associated with TIS are described in the AIM, Section 4-5-6. 190-01007-03-Final.indb 7 7/9/2015 2:07:39 PM
10-8Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexGarmin is not responsible for Mode S geographical coverage. Operation of the ground stations is the responsibility of the FAA. Refer to the Aeronautical Information Manual for a Terminal Mode S Radar Site Map covering the U.S. NOTE: TIS will be unavailable at low altitudes in many areas of the U.S., particularly in mountainous regions. Also, when flying near the “floor” of radar coverage in a particular area, intruders below the client aircraft may not be detected by TIS. TIS information is collected one radar scan prior to the scan during which the uplink occurs. Therefore, the surveillance information is approximately five seconds old. In order to present the intruders in a “real time” position, the TIS ground station uses a “predictive algorithm” in its tracking software. This algorithm uses track history data to extrapolate intruders to their expected positions consistent with the time of display in the cockpit. Occasionally, aircraft maneuvering will cause this algorithm to induce errors in the display. These errors primarily affect relative bearing information and traffic target track vector (it will lag); intruder distance and altitude will remain relatively accurate and may be used to assist in “see and avoid.” Some of the more common examples of these errors follow: • When client or intruder aircraft maneuvers excessively or abruptly, the tracking algorithm may report incorrect horizontal position until the maneuvering aircraft stabilizes. • When a rapidly closing intruder is on a course that crosses the client aircraft course at a shallow angle (either overtaking or head on) and either aircraft abruptly changes course within 0.25 NM, TIS may display the intruder on the opposite side of the client than it actually is. These are relatively rare occurrences and will be corrected in a few radar scans once the course has stabilized. 190-01007-03-Final.indb 8 7/9/2015 2:07:39 PM
10-9190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.3.6 TIS AlertsWhen the number of Traffic Advisories (TAs) on the Traffic Map Page increases from one scan to the next, the following occur: • A single “Traffic” voice alert is generated. • A TRAFFIC Annunciation appears at the bottom of the display, flashing for 5 seconds and remaining displayed until no TAs are detected in the area. To reduce the number of nuisance alerts due to proximate aircraft, the “Traffic” voice alert is generated only when the number of TAs increases. For example, when the first TA is displayed, a voice and visual annunciation are generated. As long as a single TA remains on the display, no additional voice alerts are generated. If a second TA appears on the display or if the number of TAs initially decreases and then subsequently increases, another voice alert is generated. A “Traffic Not Available” (TNA) voice alert is generated when the TIS service becomes unavailable or is out of range. Traffic may not be displayed in the radar coverage area due to the following: • Radar site TIS Mode S sensor is not operational or is out of service. • Traffic or requesting aircraft is beyond the maximum range of the TIS-capable Mode S radar site. • Traffic or requesting aircraft is above the radar site in the cone of silence and out of range of an adjacent site. • Traffic or requesting aircraft is below radar coverage. In flat terrain, the coverage extends from about 3000 feet upward at 55 miles. Terrain and obstacles around the radar site can further decrease radar coverage in all directions. • Traffic does not have an operating transponder. 190-01007-03-Final.indb 9 7/9/2015 2:07:39 PM
10-10Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.3.7 TIS System StatusThe GTN 7XX performs an automatic test of TIS during power-up. If TIS passes the test, TIS enters Standby Mode on the ground or Operating Mode in the air. If TIS fails the power up test, an annunciation is shown in the center of the Traffic Map Page. Contact a service center or Garmin dealer for corrective action for a failure message. Traffic Page Annunciation DescriptionNo Data Data is not being received from the transponderFailed The transponder has failedUnavailable TIS is unavailable or out of rangeTable 10-3 TIS Failure AnnunciationsThe Traffic mode is annunciated in the bottom left corner of the Traffic Page. When the aircraft is on the ground, TIS automatically enters Standby Mode. Once the aircraft is airborne, TIS switches to Operating Mode and traffic information is displayed. The mode can be changed manually using the Traffic Status key. Traffic StatusTraffic Mode Annunciation (Traffic On Map Page)Traffic Display Enabled Icon (Other Maps)TIS Operating OperateTIS Standby StandbyTIS Failed* TIS Fail* Contact a service center or Garmin dealer for corrective actionTable 10-4 TIS Modes Shown on the Map Page190-01007-03-Final.indb 10 7/9/2015 2:07:39 PM
10-11190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexThe annunciations that indicate the status of traffic information appear in a banner at the bottom center of maps on which traffic can be displayed. Traffic Status Banner AnnunciationDescriptionTraffic Coast 9 SECThe displayed data is not current (6 to 12 seconds since last message). The quality of displayed traffic information is reduced when this message is displayed. Traffic RemovedTraffic is removed because it is too old for coasting (12 to 60 seconds since last message). Traffic may exist within the selected display range, but it is not displayed. Table 10-5 TIS Traffic Status Annunciations190-01007-03-Final.indb 11 7/9/2015 2:07:39 PM
10-12Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.4 TAS Traffic (Optional) NOTE: TIS and Traffic Advisory System (TAS) may not both be configured at the same time. TAS data comes from a TAS unit such as a Garmin GTS 800 or 820, Skywatch 497, KTA 810, or other unit. Refer to the appropriate Traffic Advisory System’s Pilot’s Guides for a detailed discussion of the respective traffic advisory system. The type of traffic systems that is installed is described by the Traffic Page keys. If a Traffic Advisory System (TAS) is configured, a Traffic Mode and Altitude Filter key will be displayed. NOTE: Pilots should be aware of TAS system limitations. TAS systems require transponders of other aircraft to respond to system interrogations. If the transponders do not respond to interrogations due to phenomena such as antenna shading or marginal transponder performance, traffic may be displayed intermittently, or not at all. Aircraft without altitude reporting capability are shown without altitude separation data or climb descent indication. Pilots should remain vigilant for traffic at all times. WARNING: The Traffic Advisory System (TAS) is intended for advisory use only to aid the pilot in visually acquiring traffic. No avoidance maneuvers should be based solely upon TAS traffic information. It is the responsibility of the pilot in command to see and maneuver to avoid traffic. A Traffic Advisory System (TAS) enhances flight crew situational awareness by displaying traffic information for transponder-equipped aircraft. The TAS also provides visual and aural traffic alerts including voice announcements to assist in visually acquiring traffic. When the TAS is in Operating Mode, the unit interrogates the transponders of intruding aircraft while monitoring transponder replies. The TAS uses this information to derive the distance, relative bearing, and if reported, the altitude and vertical trend for each aircraft within its surveillance range. The TAS then calculates a closure rate to each intruder based on the projected Closest Point of Approach (CPA). If the closure rate meets the threat criteria for a Traffic Advisory (TA), visual and aural alerting is provided. 190-01007-03-Final.indb 12 7/9/2015 2:07:39 PM
10-13190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.4.1 TAS SymbologyTraffic Advisory System (TAS) is designed to help in detection and avoidance of other aircraft. TAS uses an on-board interrogator-processor to detect traffic. Only aircraft with operating transponders will be detected. Traffic is displayed according to TCAS symbology using four different symbols. TAS Symbol DescriptionNon-Threat Traffic(intruder is beyond 5 NM and greater than 1200 ft vertical separation)Proximity Advisory (PA)(intruder is within 5 NM and less than 1200 ft vertical separation)Traffic Advisory (TA)(closing rate, distance, and vertical separation meet TA criteria)Traffic Advisory Off ScaleTable 10-6 TAS Intruder Symbol DescriptionRelative Altitude (1200 ft Above)Vertical Trend Arrow (Climbing)Non-Threat TrafficFigure 10-7 Intruder Type, Altitude, and Vertical Trend190-01007-03-Final.indb 13 7/9/2015 2:07:40 PM
10-14Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.4.2 Displaying and Operating Traffic (TAS Systems)The unit must be in Operating mode for traffic to be displayed. The ability to switch from Standby to Operating mode on the ground is especially useful for scanning the airspace around the airport before takeoff. Heading AnnunciationRange RingsOwnship PositionNon-Threat TrafficTraffic Proximity AdvisoryAltitude FilterTraffic Status Key (Operate/Standby) Range Ring DistanceFigure 10-8 Traffic Page10.4.2.1 Switching from Standby Mode to Operating Mode 1. From the Home page, touch the Traffic key. 2. Confirm TAS is in Operating Mode. 3. Touch the Traffic Status key to toggle between Operate and Standby mode. 4. The Altitude Filter limits the traffic displayed to the Below, Normal, Above or Unrestricted altitude block as listed in the “Displayed Traffic Range” table. The filter altitudes are relative to ownship altitude. Touch the Altitude Filter key to change the altitude filter value. NOTE: Not all TAS systems can be set to “Standby” mode while in the air. The Traffic Page shows surrounding TAS traffic data in relation to the aircraft’s current position and altitude without basemap clutter. Aircraft orientation is always heading up unless no valid heading is received. The Traffic Status is annunciated in the lower left corner and the Altitude Filter is annunciated in the lower right corner. 190-01007-03-Final.indb 14 7/9/2015 2:07:40 PM
10-15190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.4.2.2 Range RingTouching the In and Out keys will zoom in and out in preset steps depending on the installed equipment as shown in the following table. Traffic Device Map RangesGarmin GTS 800, Skywatch (SKY497/SKY889)2 NM, 6 NM, 12 NMGarmin GTS 820 and 850, Honeywell KTA 810 TAS, KTA 910 TAS, KMH 820 IHAS, KMH 920 IHAS, and Avidyne TAS 620 (Ryan 9900BX)2 NM, 6 NM, 12 NM, 24 NM, 40 NMTable 10-7 Available Traffic Range Ring Steps10.4.3 Altitude Display 1. While viewing the Traffic page, touch the Traffic Status key to begin displaying traffic. “TAS OPERATING” is displayed in the Traffic mode field. 2. Touch the Altitude Filter key to change the altitude filter value. The filter altitudes are relative to ownship altitude. Select the desired altitude filter by touching the BELOW, NORMAL, ABOVE, or UNRESTRICTED keys. The selection is displayed in the Altitude mode field. Selected Altitude FilterFigure 10-9 Traffic Altitude Filter Page190-01007-03-Final.indb 15 7/9/2015 2:07:40 PM
10-16Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexAltitude Mode Displayed Traffic RangeBelow -9900 ft to 2700 ftNormal -2700 ft to 2700 ftAbove -2700 ft to 9900 ftUnrestricted All Traffic ShownTable 10-8 Displayed Traffic Range10.4.4 Traffic System Status NOTE: Refer to the equipment documentation for information on the self-test and operating modes. The Traffic Status is indicated in the lower left corner of the Traffic Page. Mode Traffic Mode Annunciation (Traffic Page)Traffic Display Enabled Icon (Other Maps)TAS Self-test Initiated TestTAS Operating OperateTAS Standby StandbyTAS Failed TAS FailTable 10-9 TAS ModesIf the unit fails, an annunciation as to the cause of the failure is shown in the center of the Traffic Page. Traffic Page Annunciation DescriptionNo Data Data is not being received from the TAS unitData Failed Data is being received from the TAS unit, but the unit is self-reporting a failureFailed Incorrect data format received from the TAS unitTable 10-10 TAS Failure Annunciations190-01007-03-Final.indb 16 7/9/2015 2:07:40 PM
10-17190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexThe annunciations to indicate the status of traffic information appear in a banner at the lower left corner of maps on which traffic can be displayed. Traffic Status Banner AnnunciationDescriptionTA 6.0 + 03 System cannot determine bearing of Traffic Advisory. Annunciation indicates distance in NM, altitude separation in hundreds of feet, and altitude trend arrow (climbing/descending). Failed Traffic data has failed. Data Fail Data is being received from the transponder, but a failure is detected in the data stream. No Data Traffic has not been detected. Table 10-11 TAS Traffic Status Annunciations190-01007-03-Final.indb 17 7/9/2015 2:07:40 PM
10-18Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.5 ADS-B TrafficADS-B technology is an important part of the FAA’s Next Generation Air Transportation System (NextGen), allowing for enhanced safety, efficiency, and the ability of the system to handle greater numbers of aircraft. ADS-B In allows a properly-equipped aircraft to access FAA broadcast services such as TIS-B and FIS-B. With ADS-B Out, the avionics transmit an aircraft’s precise location, as well as specific information about that aircraft, to ground stations and other aircraft. If more than one target is occupying the same area of the screen, the GTN will combine the two traffic targets into one traffic group. The group symbol maintains the iconology of the highest priority traffic target in the group and indicates a grouped symbol by the presence of an asterisk to the left of the grouped traffic target. Traffic targets displayed on the dedicated traffic page may be selected in order to obtain additional information about a traffic target or to view all targets in a grouped target. When a grouped target is selected, the Next key on the dedicated traffic page will cycle through all targets located in close proximity to where the screen has been touched. Selected Traffic InfoADS-B and TCAS Status and Altitude FilterTouch To View Traffic MenuSelected Vector Motion and DurationTouch For Next TargetMap OrientationRange RingsOwnship IconRange Ring RadiusAlerted Target, 1200 ft Above and ClimbingTraffic Motion VectorTouch Icon For InfoFigure 10-10 ADS-B Traffic Page NOTE: The “Next” key on the dedicated traffic page will cycle through all targets located in close proximity to where the pilot has touched the screen. 190-01007-03-Final.indb 18 7/9/2015 2:07:40 PM
10-19190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexSymbol DescriptionBasic Non-Directional TrafficBasic Directional TrafficBasic Off-scale Selected TrafficProximate Non-Directional TrafficProximate Directional TrafficProximate Off-scale Selected TrafficNon-Directional Alerted TrafficOff-Scale Non-Directional Alerted TrafficDirectional Alerted TrafficOff-Scale Directional Alerted TrafficNon-Directional Surface VehicleDirectional Surface VehicleTable 10-12 ADS-B Traffic Symbols NOTE: Color of basic and proximate traffic is dependent on configuration (cyan or white) and airborne/on-ground status of target (target is brown when on the ground, see the surface vehicles). 190-01007-03-Final.indb 19 7/9/2015 2:07:41 PM
10-20Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.5.1 Traffic Applications - SURF, AIRB, etc.The GTN ADS-B traffic display is capable of running in two “modes:” Airborne Situational Awareness (AIRB) and Surface Situation Awareness (SURF). AIRB is in operation in the en route environment, outside of five NM from and 1,500 feet above the nearest airport. SURF is in operation within the terminal environment (within five NM and less than 1,500 feet above field elevation). When SURF is running, and the zoom scale on the traffic display is less than two NM, the airport environment (including taxiways and runways) is displayed in addition to traffic. This is to aid in situational awareness of runway occupancy/availability, etc. Due to the varying precision of the data received via ADS-B, ADS-R, and TIS-B, all traffic targets may not be depicted on the traffic display. Because higher data precision is required for display in the SURF environment, some targets eligible for AIRB will not be displayed while SURF is active. Individual eligibility for AIRB and SURF is depicted in the selected traffic data on the traffic page. 10.5.2 ADS-B Traffic MenuThe Traffic Menu allows control of the traffic information display. Select Altitude Filter: Normal, Above, Below, UnrestrictedTouch To Perform Traffic TestSelect ADS-B Status:Off, Surface, or AirborneSelect Motion Vector:Absolute, Relative, OffSelect Vector Duration: 30 sec, 1 min, 2 min, 5 minSelect TCAS Status:Operate and StandbyFigure 10-11 ADS-B Traffic Menu10.5.2.1 ADS-B StatusADS-B Status displays the current status of traffic application: Off, Surface, or Airborne. Touch the ADS-B Status key to toggle the ADS-B Status. 190-01007-03-Final.indb 20 7/9/2015 2:07:41 PM
10-21190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.5.2.2 TCAS StatusThis shows the current status of the TCAS system. The modes reported by the traffic device are "Operate" while in the air and "Standby" while on the ground. This control allows the pilot to manually select the TCAS Status. Touch the TCAS Status key to toggle the TCAS Status. 10.5.2.3 TestThe Traffic Test function is only available on some TAS traffic systems. The aircraft must be on the ground and Traffic Status must be in Standby. 1. Touch the Test key to activate the test function in the Traffic equipment. 2. The unit will return to normal operation mode after the test process is successfully completed.10.5.2.4 Motion VectorWhen Absolute Motion Vectors are selected, the vectors extending from the traffic targets depict the target reported track and speed over the ground. When Relative Motion Vectors are selected, the vectors extending from the traffic targets display how the traffic target is moving relative to your aircraft. These vectors are calculated using the traffic targets track and ground speed and your aircraft’s track and ground speed. These two values are combined to depict where the traffic target is moving purely with respect to your aircraft and give a forecast of where the traffic target will be, relative to your aircraft, in the near future. Selected Vector TypeFigure 10-12 Traffic Motion Vector Type Selection NOTE: Absolute motion vectors are colored either white or cyan. Relative motion vectors are always green. The annunciation on the bottom of the dedicated traffic page indicates which vector type is selected and their length. 190-01007-03-Final.indb 21 7/9/2015 2:07:41 PM
10-22Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexSelected Traffic InfoADS-B and TCAS Status and Altitude FilterTouch To View Traffic MenuSelected Vector Motion and DurationTouch For Next TargetMap OrientationOwnship IconRange Ring Radius3000 ft Below and DescendingTraffic Motion Vector (White)Proximate Non-Directional Traffic* Indicates Multiple Targets. Touch NEXT To View Each Target. Figure 10-13 Absolute Motion (White Vectors)Selected Traffic InfoADS-B and TCAS Status and Altitude FilterTouch To View Traffic MenuSelected Vector Motion and DurationTouch For Next TargetMap OrientationOwnship IconRange Ring RadiusTraffic Motion Vector (Green)Proximate Non-Directional Traffic* Indicates Multiple Targets. Touch NEXT To View Each Target. Figure 10-14 Relative Motion (Green Vectors)190-01007-03-Final.indb 22 7/9/2015 2:07:42 PM
10-23190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexOwnship Icon Ownship IconTargetTarget Motion Vector Motion VectorFigure 10-15 Comparison of Absolute and Relative Motion Vectors With a Single TargetOwnship Icon Ownship IconTargetTarget Motion Vector Motion VectorTarget Motion VectorMotion VectorTargetFigure 10-16 Comparison of Absolute and Relative Motion Vectors With a Two Targets190-01007-03-Final.indb 23 7/9/2015 2:07:42 PM
10-24Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.5.2.5 Vector DurationThe Vector Duration selection sets the time that the vector will show the calculated distance and direction of the traffic target. A longer duration will result in a longer vector. Selected Vector DurationFigure 10-17 Traffic Motion Vector Duration Selection10.5.2.6 Altitude Filter 1. The Altitude Filter limits the traffic displayed to the Below, Normal, Above or Unrestricted altitude block as listed in the “Displayed Traffic Range” table. The filter altitudes are relative to ownship altitude. Touch the Altitude Filter key to change the altitude filter value. 2. Select the desired altitude filter by touching the BELOW, NORMAL, ABOVE, or UNRESTRICTED keys. The selection is displayed in the Altitude mode field. Selected Altitude FilterFigure 10-18 Traffic Altitude Filter Selection190-01007-03-Final.indb 24 7/9/2015 2:07:42 PM
10-25190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexAltitude Mode Displayed Traffic RangeBelow -9900 ft to 2700 ftNormal -2700 ft to 2700 ftAbove -2700 ft to 9900 ftUnrestricted All Traffic ShownTable 10-13 Displayed Traffic Range10.5.2.7 On Scene ModeWhen a GDL 88 (with software version 3.00, or later) is installed with a GTN in a helicopter, the GTN provides controls for enabling/disabling "On Scene" mode in the GDL 88. "On Scene" mode decreases traffic alerts when operating near other helicopters (e.g., news reporting). 1. While viewing the Traffic page, touch the Menu key. 2. Touch the On Scene key to enable/disable On Scene mode. 10.5.3 Rotorcraft Traffic Page Orientation NOTE: Rotorcraft Traffic Page Orientation functionality is available in software version 5.12 or later. When flying at low speeds in a helicopter, heading may not always be closely aligned with track (it could easily be up to 180 degrees different). If the GTN is interfaced with a heading source, the ADS-B traffic page will remain fixed with the ownship heading pointed up. However, if heading is not being received by the GTN, the display of ADS-B traffic will be unavailable. When one of the following conditions is true, the ADS-B traffic page will be unavailable: • Ownship directionality is invalid (no valid heading or track)• GPS ground speed is less than 15 knots and ownship heading is not availableWhile the traffic display is unavailable due to these conditions, traffic alerts will be provided in a non-bearing textual form at the top of the traffic page. 190-01007-03-Final.indb 25 7/9/2015 2:07:43 PM
10-26Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.6 RYAN TCAD 9900BX with the GDL 88Ryan TCAD is a system that provides audio and visual alerts for traffic near your aircraft. The information from this system can be interfaced through the GTN series. Operating instructions and details on the modes of operation are described in the Ryan TCAD operator’s handbooks. • TCAS-like symbols are used in the 9900BX. • Altitude modes are available (normal, look up, look down, unrestricted). • Ranges are manually controlled for the current shield. • Traffic display range selections: - Ryan 9900BX — 1 NM, 1 and 2 NM, 2 and 6 NM, 6 and 12 NM, and 12 and 24 NM. 10.6.1 Ryan TCAD Description NOTE: Refer to the Ryan TCAD Pilot’s Guide for a detailed description of the Ryan TCAD System. The Ryan TCAD (Traffic and Collision Alert Device) is an on-board air traf-fic display used to identify potential collision threats. TCAD computes rela-tive altitude and range of threats from nearby Mode C and Mode S-equipped aircraft. TCAD will not detect aircraft without operating transponders or those that are beyond radar coverage. TCAD, within defined limits, creates a “shield” of airspace around the aircraft that detected traffic cannot penetrate without triggering an alert. TA: Traffic Advisory. This is traffic with 500 feet, or less, of altitude separation that is converging or maintaining altitude separation. PA: Proximity Advisory. This is traffic with 500 feet of altitude separation that is not a TA. TRFC: Other traffic. 190-01007-03-Final.indb 26 7/9/2015 2:07:43 PM
10-27190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexSelected Traffic InfoADS-B and TCAD Status and Altitude FilterTraffic AnnunciationSelected Vector Motion and DurationTouch For Next TargetMap OrientationOwnship IconRange Ring RadiusAlerted Target, 1200 ft Above and Climbing Traffic Motion VectorTouch Icon For InfoTouch To View Traffic MenuFigure 10-19 Traffic Page for Ryan TCAD with GDL 8810.6.2 Altitude ModeThe GDL 88 has four altitude display modes: Normal (±2,700 feet, Above (-2,700 feet to +9,000 feet), Below (-9,000 feet to +2,700 feet), and Unrestricted (±9,900 feet). The GDL 88 continues to track up to 30 intruder aircraft within its maximum surveillance range, regardless of the altitude display mode selected. The selected altitude display mode is displayed in the upper left-hand corner of the Traffic page. The Altitude Filter limits the traffic displayed to the Below, Normal, Above or Unrestricted altitude block as listed in the “Displayed Traffic Range” table. The filter altitudes are relative to ownship altitude. While viewing the Traffic page, touch the Altitude Filter key to change the altitude filter value. Select the desired altitude filter by touching the BELOW, NORMAL, ABOVE, or UNRESTRICTED keys. The selection is displayed in the Altitude mode field. 190-01007-03-Final.indb 27 7/9/2015 2:07:43 PM
10-28Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexSelected Altitude FilterFigure 10-20 Traffic Altitude Filter SelectionAltitude Mode Displayed Traffic RangeBelow -9900 ft to 2700 ftNormal -2700 ft to 2700 ftAbove -2700 ft to 9900 ftUnrestricted All Traffic ShownTable 10-14 Displayed Traffic Range10.6.3 TCAD Control MenuThe TCAD Control Menu allows control over the settings for the TCAD Traffic display. Select TCAD Control MenuFigure 10-21 TCAD Traffic Menu 1. While viewing the Traffic menu, touch the TCAD Control key. Set Traffic Audio VolumeActivate OperationSelect Field ElevationSelect Ground ModeSelect Approach Mode: Set, Armed, or ActiveSelect Local BaroFigure 10-22 TCAD Control Menu 2. Touch the desired key from the menu to make any settings. 190-01007-03-Final.indb 28 7/9/2015 2:07:43 PM
10-29190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.6.3.1 Traffic Audio 1. While viewing the TCAD Control menu, touch the Traffic Audio key. Touch To Raise The VolumeTouch To Lower The VolumeBar Graph Showing Volume LevelFigure 10-23 TCAD Traffic 2. Touch the arrow keys to raise or lower the TCAD Traffic Audio level. The selected volume will be shown as a percentage value and graphically with a bar graph. 3. Touch the Back key to return to the TCAD Control menu. 10.6.3.2 Field Elevation 1. While viewing the TCAD Control menu, touch the Field Elevation key. Touch To Automatically Select The Destination Airport Field ElevationTouch To Manually Set Field ElevationFigure 10-24 TCAD Traffic Field Elevation Selection 2. With the Use DEST APT key deactivated (no green bar), touch the Field Elevation key to manually select the Field Elevation for traffic reporting. Use the keypad to select the elevation value. 3. Touch the Enter key to accept the selected value. The selected value will be shown in the Field Elevation key. 4. Touch the Use DEST APT key to automatically use the field elevation of the destination airport of the active flight plan for traffic reporting. NOTE: Activating the Use DEST APT feature automatically uses the elevation for the current destination airport for the TCAD. If no destination airport is present in the GTN system, the TCAD will not receive a field elevation and therefore not automatically enter approach mode. 190-01007-03-Final.indb 29 7/9/2015 2:07:43 PM
10-30Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.6.3.3 Baro 1. While viewing the TCAD Control menu, touch the BARO key to manually select the barometric pressure. 2. Use the keypad to select the barometric pressure value. 3. Touch the Enter key to accept the selected value. The selected value will be shown in the BARO key. 10.6.3.4 Operate 1. While viewing the TCAD Control menu, touch the Operate key to activate TCAD traffic. 2. Touching the Operate key toggles TCAD traffic operation on and off. 10.6.3.5 Ground Mode 1. While viewing the TCAD Control menu, touch the Ground key to activate Ground Mode TCAD traffic. 2. Touching the Ground key toggles Ground Mode on and off. 10.6.3.6 Approach Mode 1. While viewing the TCAD Control menu, touch the Approach key to activate Approach Mode TCAD traffic. 2. Touching the Approach key toggles Approach Mode on and off. 190-01007-03-Final.indb 30 7/9/2015 2:07:43 PM
10-31190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.7 TCAD 9900B OperationThe TCAD 9900B provides a passive system that uses transponder replies from other aircraft to acquire traffic information. Traffic Advisory Separation 00 Feet, OpeningTouch To Select Barometric PressureMap OrientationOwnship IconRange Ring RadiusAltitude Separation 900 Feet, ClosingTouch To Select Active ShieldTouch To View Traffic MenuTraffic Advisory Altitude Separation 0 Feet, Steady Altitude SeparationFigure 10-25 Traffic Page for Ryan TCAD 9900BSymbol DescriptionImminent Traffic(Traffic within ±500 feet AND 1.0 NM; OR no altitude AND within 1.0 NM)Non-Imminent TrafficTraffic Closing VerticallyTraffic Diverging VerticallyTraffic not Closing or Diverging VerticallyTable 10-15 9900B TCAD Symbols10.7.1 Select Local Barometric Pressure 1. While viewing the TCAD display, touch the Baro key to select the local barometric pressure. 2. Use the keypad to select the values and touch Enter to save the values. 190-01007-03-Final.indb 31 7/9/2015 2:07:44 PM
10-32Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.7.2 Select Active Shield 1. While viewing the TCAD display, touch the Active Shield key to select the Active Shield values (Departure, Enroute, or Ground). 2. Touch the desired setting to save the values. 10.7.3 TCAD 9900B Traffic MenuThe TCAD 9900B Menu allows control over the settings for the TCAD Traffic display. 1. While viewing the Traffic page, touch the Menu key. Set Traffic Audio VolumeSelect Shield SetupSelect Approach Mode: Set, Armed, or ActiveFigure 10-26 TCAD 9900B Traffic Menu 2. Touch the desired key from the menu to make any settings. 10.7.3.1 Traffic Audio 1. While viewing the TCAD Control menu, touch the Traffic Audio key. Touch To Raise The VolumeTouch To Lower The VolumeBar Graph Showing Volume LevelFigure 10-27 TCAD Traffic Audio 2. Touch the arrow keys to raise or lower the TCAD Traffic Audio level. The selected volume will be shown as a percentage value and graphically with a bar graph. 3. Touch the Back key to return to the TCAD Control menu. 190-01007-03-Final.indb 32 7/9/2015 2:07:44 PM
10-33190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.7.3.2 Shield SetupThe Shield Setup function allows you to select the Shield Type (mode of operation) and the size of the shield volume that will provide alerts when entered by aircraft. Approach Shield Type 1. While viewing the TCAD Control menu, touch the Shield Type key and touch the Approach Shield Type. Touch To Automatically Select The Destination Airport Field ElevationTouch To Manually Set Field ElevationTouch To Select Shield Type: Approach or Standard Figure 10-28 TCAD 9900B Shield Setup for Approach 2. Touch the Field Elevation key. 3. With the Use DEST APT key deactivated (no green bar), touch the Field Elevation key to manually select the Field Elevation for traffic reporting. Use the keypad to select the elevation value. 4. Touch the Enter key to accept the selected value. The selected value will be shown in the Field Elevation key. 5. Touch the Use DEST APT key to automatically use the field elevation of the destination airport of the active flight plan for traffic reporting. NOTE: Activating the Use DEST APT feature automatically uses the elevation for the current destination airport for the TCAD. If no destination airport is present in the GTN system, the TCAD will not receive a field elevation and therefore not automatically enter approach mode. 190-01007-03-Final.indb 33 7/9/2015 2:07:44 PM
10-34Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexEn Route, Standard, or Terminal Shield Type 1. While viewing the TCAD Control menu, touch the Shield Type key and touch the desired Shield Type: Enroute, Standard, or Terminal. Touch To Shield RangeTouch To Manually Set Shield HeightTouch To Select Shield Type: Approach or Standard Figure 10-29 TCAD 9900B Shield Setup for En Route, Standard, and Terminal 2. Touch the Shield Height key and use the keypad to select the Shield Height value. The selected value will be shown in the Shield Range key. 3. Touch the Shield Range key and use the keypad to select the Shield Range value. The selected value will be shown in the Shield Range key. 10.7.3.3 Approach Mode 1. While viewing the TCAD Control menu, touch the Approach key to activate Approach Mode TCAD traffic. 2. Touching the Approach key toggles Approach Mode between Set, Armed, or Active. 190-01007-03-Final.indb 34 7/9/2015 2:07:44 PM
10-35190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.8 TCAD 9900BX OperationThe TCAD 9900BX provides an active system that interrogates other aircraft to acquire traffic information. Other Traffic, Separation 1300 Feet AboveTouch To Select Barometric PressureMap OrientationOwnship IconRange Ring RadiusAltitude Separation 1600 Feet, AscendingTouch To Select Altitude FilterTouch To View Traffic MenuTraffic Advisory Altitude Separation 200 Feet, DescendingTraffic AnnunciationFigure 10-30 Traffic Page for Ryan TCAD 9900BXSymbol DescriptionTraffic AdvisoryProximity Advisory(color may be configured as cyan)Other Traffic(color may be configured as cyan)Out-of-Range Traffic AdvisoryTable 10-16 9900BX (TCAS) Symbols10.8.1 Select Local Barometric Pressure 1. While viewing the TCAD display, touch the Baro key to select the local barometric pressure. 2. Use the keypad to select the values and touch Enter to save the values. 190-01007-03-Final.indb 35 7/9/2015 2:07:45 PM
10-36Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.8.2 Select Altitude Filter The Altitude Filter limits the traffic displayed to the Below, Normal, Above or Unrestricted altitude block as listed in the “Displayed Traffic Range” table. The filter altitudes are relative to ownship altitude. While viewing the Traffic page, touch the Altitude Filter key to change the altitude filter value. Select the desired altitude filter by touching the Normal, Above, Below, or Unrestricted keys. The selection is displayed in the Altitude Filter field. Selected Altitude FilterFigure 10-31 Traffic Altitude Filter SelectionAltitude Mode Displayed Traffic RangeBelow -9900 ft to 2700 ftNormal -2700 ft to 2700 ftAbove -2700 ft to 9900 ftUnrestricted All Traffic ShownTable 10-17 Displayed Traffic Range10.8.3 TCAD 9900BX Traffic MenuThe TCAD 9900BX Menu allows control over the settings for the TCAD Traffic display. 1. While viewing the Traffic page, touch the Menu key. Set Traffic Audio VolumeSelect Shield SetupSelect Approach Mode: Set, Armed, or ActiveToggle Ground Mode On or OffFigure 10-32 TCAD 9900BX Traffic Menu 2. Touch the desired key from the menu to make any settings. 190-01007-03-Final.indb 36 7/9/2015 2:07:45 PM
10-37190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex10.8.3.1 Traffic Audio 1. While viewing the TCAD Control menu, touch the Traffic Audio key. Touch To Raise The VolumeTouch To Lower The VolumeBar Graph Showing Volume LevelFigure 10-33 TCAD Traffic Audio 2. Touch the arrow keys to raise or lower the TCAD Traffic Audio level. The selected volume will be shown as a percentage value and graphically with a bar graph. 3. Touch the Back key to return to the TCAD Control menu. 10.8.3.2 Shield SetupThe Shield Setup function allows you to select the Shield Type (mode of operation) and the size of the shield volume that will provide alerts when entered by aircraft.Approach Shield Type 1. While viewing the TCAD Control menu, touch the Shield Type key and touch the Approach Shield Type. Touch To Automatically Select The Destination Airport Field ElevationTouch To Manually Set Field ElevationTouch To Select Shield Type: Approach or Standard Figure 10-34 TCAD 9900BX Shield Setup for Approach 2. Touch the Field Elevation key. 3. With the Use DEST APT key deactivated (no green bar), touch the Field Elevation key to manually select the Field Elevation for traffic reporting. Use the keypad to select the elevation value. 190-01007-03-Final.indb 37 7/9/2015 2:07:45 PM
10-38Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex 4. Touch the Enter key to accept the selected value. The selected value will be shown in the Field Elevation key. 5. Touch the Use DEST APT key to automatically use the field elevation of the destination airport of the active flight plan for traffic reporting. NOTE: Activating the Use DEST APT feature automatically uses the elevation for the current destination airport for the TCAD. If no destination airport is present in the GTN system, the TCAD will not receive a field elevation and therefore not automatically enter approach mode.En Route, Standard, or Terminal Shield Type 1. While viewing the TCAD Control menu, touch the Shield Type key and touch the desired Shield Type: Enroute, Standard, or Terminal. Touch To Shield RangeTouch To Manually Set Shield HeightTouch To Select Shield Type: Approach or Standard Figure 10-35 TCAD 9900BX Shield Setup for En Route, Standard, and Terminal 2. Touch the Shield Height key and use the keypad to select the Shield Height value. The selected value will be shown in the Shield Range key. 3. Touch the Shield Range key and use the keypad to select the Shield Range value. The selected value will be shown in the Shield Range key.10.8.3.3 Approach Mode 1. While viewing the Traffic menu, touch the Approach key to activate Approach Mode TCAD traffic. 2. Touching the Approach key toggles Approach Mode between Set, Armed, or Active. 10.8.3.4 Ground Mode 1. While viewing the Traffic menu, touch the Ground key to activate Ground Mode TCAD traffic. 2. Touching the Ground key toggles Ground Mode between On and Off. 190-01007-03-Final.indb 38 7/9/2015 2:07:45 PM
11-1190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex11 TERRAIN11.1 Terrain ConfigurationsDuring power-up of the GTN 7XX, the terrain/obstacle database versions are displayed along with a disclaimer. At the same time, the Terrain system self-test begins. A failure message is issued if the terrain test fails. Garmin provides the following terrain awareness solutions within the GTN 7XX environment: • Terrain Proximity - This is the standard Terrain function and refers to the display of the relative terrain elevations on the moving map. No aural alerts of any type are provided by a Terrain Proximity configuration. • TAWS-B (Optional) - A system developed to meet the terrain alerting and ground proximity requirements for Class B TAWS systems as defined in TSO-C151c. Garmin’s GTN 7XX Terrain Awareness and Warning System (TAWS-B) is an optional feature and is intended to provide the flight crew with both aural and visual alerts to aid in preventing inadvertent Controlled Flight Into Terrain (CFIT). • HTerrain Proximity - This is the standard Terrain function and refers to the display of the relative terrain elevations on the moving map. No aural alerts of any type are provided by a Terrain Proximity configuration. • HTAWS - (HTAWS) is an optional feature to increase situational awareness and aid in reducing controlled flight into terrain. Garmin TAWS satisfies TSO-C194 requirements for certification. • TAWS-A (Optional) - A system to increase situational awareness and aid in reducing controlled flight into terrain (CFIT) as defined in TSO-C151c. TAWS-A provides visual and aural annunciations when terrain and obstacles are within the given altitude threshold from the aircraft. NOTE: Obstacles are removed from the Terrain and TAWS pages at ranges greater than 10 NM. 190-01007-03-Final.indb 1 7/9/2015 2:07:45 PM
11-2Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.2 General Database InformationGarmin TAWS and HTAWS use terrain and obstacle information supplied by government and private sources. The data undergoes verification by Garmin to confirm accuracy of the content. However, the displayed information should never be understood as being all-inclusive. Pilots must familiarize themselves with the appropriate charts for safe flight. NOTE: The data contained in the terrain and obstacle databases comes from government and private agencies. Garmin accurately processes and cross-validates the data, but cannot guarantee the accuracy and completeness of the data. The terrain database is contained on the datacard. 11.2.1 Database VersionsThe version and area of coverage of each terrain/obstacle database is shown on the System-System Status page. Databases are checked for integrity at power-up. If a database is found to be missing and/or deficient, the TAWS/HTAWS system fails the self-test and displays the TAWS/HTAWS system failure message. 11.2.2 HTAWS Database RequirementsTo function properly, HTAWS requires the use of databases specific to helicopters and HTAWS. The databases required are: • 2.5 arc-second Terrain Database• Helicopter Obstacle Database• Helicopter Navigation Database11.2.3 Database UpdatesTerrain and obstacle databases are updated periodically with the latest terrain and obstacle data. Visit the Garmin website to check for newer versions of terrain/obstacle databases. Compare database cycle numbers to determine if a newer version is available. The database update process includes either reprogramming or replacing the database card and inserting the updated card in the card slot on the unit front panel. The terrain/obstacle database may be downloaded via the internet and the card reprogrammed using a USB programmer available from Garmin. Contact Garmin at 866-739-5687 or at www.garmin.com or http://fly.garmin.com for more information. 190-01007-03-Final.indb 2 7/9/2015 2:07:46 PM
11-3190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexTo update your terrain/obstacle databases: 1. Prepare the card with new terrain data. 2. Turn off the power to the unit. 3. Remove the old terrain data card and insert the new card into the unit. 4. Turn on the unit and verify that the Terrain Database verification is succesful. 5. Verify that TAWS/HTAWS passes the self-test (if configured for TAWS or HTAWS). 11.2.4 Terrain Database Areas of CoverageThe fixed-wing terrain database provides worldwide coverage. The following describes the area of coverage available in each helicopter terrain database. Regional definitions may change without notice. Database Coverage AreaAmericas - North Latitudes: 0° to N90° Longitudes: W180° to W30°Americas - South Latitudes: N30° to S90° Longitudes: W180° to W30°Atlantic - North Latitudes: 0° to N90° Longitudes: W30° to E90°Atlantic - South Latitudes: N30° to S90° Longitudes: W30° to E90°Pacific - North Latitudes: 0° to N90° Longitudes: E60° to E180°Pacific - South Latitudes: N30° to S90° Longitudes: E60° to E180°Table 11-1 Terrain Database Coverage NOTE: Because of higher resolution helicopter terrain data, the world-wide data won't fit on the terrain database card. Therefore, data is regionalized. If you have the wrong region database for your present position, then you get the message that terrain is unavailable for the current location and a crosshatched pattern on the terrain display. 190-01007-03-Final.indb 3 7/9/2015 2:07:46 PM
11-4Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.2.5 Obstacle Database Areas of CoverageThe following describes the area of coverage available in each database. Regional definitions may change without notice. Database Coverage AreaUnited States (US) Limited to the United States plus some areas of Canada, Mexico, Caribbean, and the Pacific. US/EuropeAlaska, Austria, Belgium, Canada*, Caribbean*, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hawaii, Iceland, Ireland, Italy, Latvia, Lithuania, Mexico*, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, Switzerland, United Kingdom, United States* Indicates partial coverageTable 11-2 Obstacle Database Coverage NOTE: It is very important to note that not all obstacles are necessarily charted and therefore may not be contained in the Obstacle Database. Obstacle databases created for GTN software version 5.10 or later include all power lines or only HOT lines depending on the type of obstacle database installed. Hazardous Obstacle Transmission (HOT) Lines are those power lines that are co-located with other FAA-identified obstacles. The installed obstacle database type can be verified on the System Status page. Power line data is available for the contiguous United States as well as small parts of Canada and Mexico. 190-01007-03-Final.indb 4 7/9/2015 2:07:46 PM
11-5190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.3 Terrain ProximityGarmin Terrain Proximity is a non-TSO-C151c-certified terrain awareness system provided as a standard feature of GTN 7XX to increase situational awareness and help reduce controlled flight into terrain (CFIT). Terrain may be displayed on the Map and Terrain pages. Terrain Proximity uses information provided from the GPS receiver to provide a horizontal position and altitude. GPS altitude is derived from satellite measurements. GPS altitude is converted to a Mean Sea Level (MSL)-based altitude (GSL altitude) and is used to determine Terrain alerts. GSL altitude accuracy is affected by factors such as satellite geometry, but it is not subject to variations in pressure and temperature that normally affect pressure altitude devices. GSL altitude does not require local altimeter settings to determine MSL altitude. Therefore, GPS altitude provides a highly accurate and reliable MSL altitude source to calculate terrain and obstacle alerts. Terrain utilizes terrain and obstacle databases that are referenced to mean sea level (MSL). Using the GPS position and GSL altitude, Terrain displays a 2-D picture of the surrounding terrain and obstacles relative to the position and altitude of the aircraft. In this manner, Terrain Proximity can provide advanced alerts of predicted dangerous terrain conditions. Terrain requires the following to operate properly: • The system must have a valid 3-D GPS position solution. • The system must have a valid terrain/obstacle database. 360ArcViewFlight PlanLegendLayersFigure 11-1 Terrain Proximity Page Functional Diagram190-01007-03-Final.indb 5 7/9/2015 2:07:46 PM
11-6Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.3.1 Displaying Terrain ProximityThe Terrain page is in the Terrain function. 1. Touch the Terrain key on the Home page. Heading AnnunciationOwnship PositionAircraft GSL Value(GPS Derived)Range RingsTerrain Menu KeyTerrain Page TitleRed Terrain Is Above Or Within 100 ft Below The Aircraft AltitudeYellow Terrain Is Between 100 ft and 1000 ft Below The Aircraft AltitudeActive Flight Plan LegTerrain TypeIcon shows wire obstacle overlay is active (software version 5.12, or later)Icon shows point obstacle overlay is active (software version 5.12, or later)Figure 11-2 Terrain Page 2. Touch the Menu key for options. Selected View Flight Plan Selected To ShowTerrain and Obstacle Legend Selected To ShowFigure 11-3 Terrain Menu Options190-01007-03-Final.indb 6 7/9/2015 2:07:46 PM
11-7190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.3.1.1 Terrain Page 120° Arc or 360° RingsSelect the 120º Arc or 360º rings overlay for the Terrain page with either the 360 or Arc keys from the Menu. 1. While viewing the Terrain page, touch the Menu key. 2. Touch the 360º or Arc key. 120° Arc OutlineOuter Arc RangeAircraft GSL Value(GPS Derived)Obstacle Scale (software version 6.00, or later)Red Terrain Is Above Or Within 100 ft Below The Aircraft AltitudeYellow Terrain Is Between 100 ft and 1000 ft Below The Aircraft AltitudeTerrain TypeTerrain ScaleHeading AnnunciationFigure 11-4 Terrain 120° Arc View11.3.1.2 Display Flight Plan on Terrain PageSelect the display of the active flight plan on the Terrain page. Touch the Flight Plan key to toggle the display of active flight plan on or off. 11.3.1.3 Display Terrain and Obstacle LegendSelect the display of the Terrain Legend on the Terrain page. Touch the Legend key to toggle the display of the Terrain Legend on or off. 190-01007-03-Final.indb 7 7/9/2015 2:07:46 PM
11-8Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.3.2 Terrain LimitationsTerrain Proximity displays terrain and obstructions relative to the altitude of the aircraft. The displayed alerts are advisory in nature only. Individual obstructions may be shown if available in the database. However, all obstructions may not be available in the database and data may be inaccurate. Terrain information should be used as an aid to situational awareness. Never use this information for navigation or to maneuver to avoid obstacles. Terrain Proximity uses terrain and obstacle information supplied by government sources. The displayed information should never be understood as being all-inclusive. NOTE: The data contained in the Terrain databases comes from government agencies. Garmin accurately processes and cross-validates the data but cannot guarantee the accuracy and completeness of the data. NOTE: TERRAIN, TAWS-A, TAWS-B, HTAWS, or HTERRAIN PROXIMITY functionality will be available via the Terrain page, depending on the installed hardware and configuration. HTAWS or HTERRAIN PROXIMITY are available in software version 4.00, or later. TAWS-A is available in software version 5.00, or later. 190-01007-03-Final.indb 8 7/9/2015 2:07:46 PM
11-9190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.4 Terrain Awareness and Warning System (TAWS-B) OptionalTAWS (Terrain Awareness and Warning System) is an optional feature to increase situational awareness and aid in reducing controlled flight into terrain (CFIT). TAWS provides visual and aural annunciations when terrain and obstacles are within the given altitude threshold from the aircraft. TAWS satisfies TSO-C151c Class B requirements for certification. Class B TAWS is required for all Part 91 turbine aircraft operations with six or more passenger seats and for Part 135 turbine aircraft operations with six to nine passenger seats (FAR Parts 91.223, 135.154). 11.4.1 TAWS-B RequirementsTAWS requires the following to operate properly: • A valid terrain/obstacle database• A valid 3-D GPS position solution11.4.2 TAWS-B Limitations NOTE: The data contained in the TAWS databases comes from government agencies. Garmin accurately processes and cross-validates the data but cannot guarantee the accuracy and completeness of the data. TAWS displays terrain and obstructions relative to the altitude of the aircraft. Compliance with TAWS B alerts and warnings is MANDATORY. When a TAWS B “pull up” annunciation is issued, the pilot is required to pull up. TAWS uses terrain and obstacle information supplied by government sources. Terrain information is based on terrain elevation information in a database that may contain inaccuracies. Individual obstructions may be shown if available in the database. The data undergoes verification by Garmin to confirm accuracy of the content, per TSO-C151c. 190-01007-03-Final.indb 9 7/9/2015 2:07:46 PM
11-10Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.4.3 Computing GPS Altitude for TAWSTAWS uses information provided from the GPS receiver to provide a horizontal position and altitude. GPS altitude is derived from satellite measurements. GPS altitude is converted to a Mean Sea Level (MSL)-based altitude (GSL altitude) and is used to determine TAWS alerts. GSL altitude accuracy is affected by factors such as satellite geometry, but it is not subject to variations in pressure and temperature that normally affect pressure altitude devices. GSL altitude does not require local altimeter settings to determine MSL altitude. Therefore, GPS altitude provides a highly accurate and reliable MSL altitude source to calculate terrain and obstacle alerts. The terrain and obstacle databases used by TAWS are referenced to Mean Sea Level. Using the GPS position and GSL altitude, TAWS displays a 2-D picture of the surrounding terrain and obstacles relative to the position and altitude of the aircraft. Furthermore, the GPS position and GSL altitude are used to calculate and “predict” the aircraft’s flight path in relation to the surrounding terrain and obstacles. In this manner, TAWS can provide advanced alerts of predicted dangerous terrain conditions. 11.4.4 Baro-Corrected Altitude Versus GSL AltitudeBaro-corrected altitude (or indicated altitude) is derived by adjusting the altimeter setting for local atmospheric conditions. The most accurate baro-corrected altitude can be achieved by frequently updating the altimeter setting to the nearest reporting station along the flight path. However, because actual atmospheric conditions seldom match the standard conditions defined by the International Standard Atmosphere (ISA) model (where pressure, temperature, and lapse rates have fixed values), it is common for the baro-corrected altitude (as read from the altimeter) to differ from the GSL altitude. This variation results in the aircraft’s true altitude differing from the baro-corrected altitude. 190-01007-03-Final.indb 10 7/9/2015 2:07:46 PM
11-11190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.4.5 Using TAWS-BDuring unit power-up, the terrain/obstacle database versions are displayed. At the same time, TAWS self-test begins. One of the following aural messages is generated: • “TAWS System Test OK”• “TAWS System Failure”TAWS information can be displayed on the Map page. Terrain and obstacles with heights greater than 200 feet Above Ground Level (AGL) are displayed in yellow and red. The GTN 7XX adjusts colors automatically as the aircraft altitude changes. 360ArcViewFlight PlanLegendLayersTAWS InhibitTest TAWSTAWSFigure 11-5 TAWS-B Page Functional Diagram11.4.6 Displaying TAWS-B DataTAWS uses yellow (caution) and red (warning) to depict terrain and obstaclesalerts relative to aircraft altitude. Colors are adjusted automatically as the aircraft altitude changes. The colors and symbols shown below are used to represent terrain, obstacles, and threat locations. Obstacles are removed when more than 2000 ft below the aircraft. 190-01007-03-Final.indb 11 7/9/2015 2:07:47 PM
11-12Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexThreat LocationUnlighted ObstacleProjected Flight Path1000 ft 100 ft Threshold Terrain more than 1000 ft below the aircraft altitude (Black)Terrain between 100 ft and 1000 ft below the aircraft altitude (Yellow)Terrain above or within 100 ft below the aircraftaltitude (Red) Figure 11-6 Terrain Altitude/Color Correlation for TAWS-BUnlighted Obstacle Lighted Obstacle Threat Location Indicator Terrain ColorTerrain/Obstacle LocationAlert Level< 1000 ft AGL> 1000 ft AGL< 1000 ft AGL> 1000 ft AGLObstacle SymbolRedTerrain/Obstacle at or within 100 ft below current aircraft altitudeWARNING (Red)YellowTerrain/Obstacle between 100 ft and 1000 ft below current aircraft altitudeCAUTION (Yellow)WhiteTerrain/Obstacle between 1000 ft and 2000 ft below current aircraft altitudeTable 11-3 TAWS-B Terrain/Obstacle Colors and Symbology190-01007-03-Final.indb 12 7/9/2015 2:07:47 PM
11-13190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexTower Windmill Windmill in Group Power LineTable 11-4 Obstacle Icon TypesGrouped obstacles are shown with an asterisk (as shown in the Windmill in Group example above). The color of the asterisks is tied to the relative altitude of the highest obstacle in the group, not other obstacles within that group. Obstacles are grouped when they would otherwise overlap. 11.4.7 TAWS-B PageTAWS information is displayed on the Map and Terrain pages. The TAWS Page is specialized to show terrain, obstacle, and threat location data in relation to the aircraft’s current altitude, without clutter from the basemap. Flight plan information (airports, VORs, and other NAVAIDs) included in the flight plan are displayed for reference. If an obstacle and the projected flight path of the aircraft intersect, the display automatically zooms in to the closest threat location on the TAWS Page. Aircraft orientation on this map is always heading up unless there is no valid heading. If orientation is not heading up, it will be track up. Two views are available relative to the position of the aircraft: the 360° default display and the radar-like ARC (120°) display. Map range is adjustable with the In and Out keys from 1 to 200 NM, as indicated by the map range rings (or arcs). 11.4.7.1 Terrain Page Layers 1. While viewing the Terrain page, touch the Menu key. Select Terrain View Select Displayed LayerSelect TAWS FunctionFigure 11-7 Terrain Page TAWS-B Menu190-01007-03-Final.indb 13 7/9/2015 2:07:47 PM
11-14Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex 2. Touch the Flight Plan key to toggle the display of the active flight plan. Terrain OverlayFlight PlanTAWS-B AnnunciationTerrain LegendIcon shows wire obstacle overlay is active (software version 5.12, or later)Icon shows point obstacle overlay is active (software version 5.12, or later)Obstacle Legend (software version 6.00, or later)Figure 11-8 Flight Plan and Legend Shown On TAWS-B Terrain Page 3. Touch the Legend key to toggle the display of the Terrain and Obstacle legend. 11.4.7.2 Terrain Page ViewSelect the 120º Arc or 360º rings overlay for the Terrain page with either the 360 or Arc keys from the Menu. 1. While viewing the Terrain page, touch the Menu key. 2. Touch the 360º or Arc key. 11.4.7.3 Terrain Page TAWS-B SelectionsThe TAWS selections allow you to inhibit aural TAWS alerts and to send a request to the TAWS equipment to run its internal tests. After cycling power, TAWS will no longer be inhibited. 1. While viewing the Terrain page, touch the Menu key. 190-01007-03-Final.indb 14 7/9/2015 2:07:47 PM
11-15190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex 2. Touch the TAWS Inhibit key to toggle the inhibiting of TAWS alerts. Test TAWS - Only Available on GroundTAWS Inhibited AnnunciationTAWS Alerts Inhibited Figure 11-9 TAWS-B Alerts Inhibited Selected 3. Touch the Test TAWS key to test the TAWS system. This function is not available when the aircraft is in the air. TAWS Test AnnunciationTAWS Test DisplayFigure 11-10 TAWS-B Test Selected11.4.8 TAWS-B AlertsAlerts are issued when flight conditions meet parameters that are set within TAWS software algorithms. When an alert is issued, visual annunciations are displayed and aural alerts are simultaneously issued. TAWS alert types are shown in the TAWS Alerts Summary with corresponding annunciations and aural messages. When an alert is issued, annunciations appear on the TAWS page. If the TAWS page is not displayed at the time, a pop-up alert appears on the page being viewed. 190-01007-03-Final.indb 15 7/9/2015 2:07:48 PM
11-16Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexBlinking MessageTouch To Display Terrain PageTouch To Remove Pop-Up And Remain On Current PageObstacle GroupTAWS AnnunciationFigure 11-11 Terrain Alert Pop-UpTo acknowledge the pop-up alert: Touch the Go to Terrain key (accesses the TAWS Page) OR Touch the Close key to remove the pop-up alertIf the pilot takes no action, the pop-up will be removed when the alert is no longer active. 11.4.8.1 TAWS-B Alerting Colors and SymbologyColor and symbols are also associated with TAWS alerts. The alert annunciations show in the bottom left corner of the display. The three TAWS alert levels and their associated text coloring as well as any associated symbology are shown in the following table. Alert Level Annunciator Text Threat Location IndicatorExample Visual AnnunciationWarning White text on red backgroundCaution Black text on yellow backgroundInformational Black text on white backgroundNot ApplicableTable 11-5 TAWS-B Alert Colors and Symbology190-01007-03-Final.indb 16 7/9/2015 2:07:48 PM
11-17190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexAlert Type Alert Annunciation Aural MessageExcessive Descent Rate Warning (EDR-W)“Pull Up”FLTA Terrain Warning(RTC-W, ITI-W)“Terrain Ahead, Pull Up; Terrain Ahead, Pull Up”* or “Terrain, Terrain; Pull Up, Pull Up”FLTA Obstacle Warning (ROC-W, IOI-W)“Obstacle Ahead, Pull Up; Obstacle Ahead, Pull Up”* or “Obstacle, Obstacle; Pull Up, Pull Up”FLTA Wire Warning (ILI-W, RLC-W)"Wire Ahead Pull Up, Wire Ahead Pull Up"FLTA Terrain Caution (RTC-C, ITI-C)“Terrain Ahead; Terrain Ahead”* or “Caution, Terrain; Caution, Terrain”FLTA Obstacle Caution (ROC-C, IOI-C)“Obstacle Ahead; Obstacle Ahead”* or “Caution, Obstacle; Caution, Obstacle”FLTA Wire Caution (ILI-C, RLC-C)"Wire Ahead"Premature Descent Alert Caution (PDA)“Too Low, Terrain”Excessive Descent Rate Caution (EDR-C)“Sink Rate”Negative Climb Rate Caution (NCR-C)“Don’t Sink”*or“Too Low, Terrain”Voice Call Out(VCO-500)None“Five-Hundred”* Alerts with multiple messages are configurable at installation and are installation-dependent. Alerts for the default configuration are indicated with asterisks. Table 11-6 TAWS-B Alerts Summary190-01007-03-Final.indb 17 7/9/2015 2:07:48 PM
11-18Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.4.8.2 Excessive Descent Rate AlertThe purpose of the Excessive Descent Rate (EDR) alert is to provide notification when the aircraft is determined to be descending upon terrain at an excessive rate. The parameters for the alert as defined by TSO-C151c are shown below.    "PULL UP""PULL UP""SINK RATE"$ESCENT2ATEHeight Above Terrain (Feet)Figure 11-12 Excessive Descent Rate Alert Criteria11.4.8.3 Forward Looking Terrain AvoidanceReduced Required Terrain Clearance (RTC), Reduced Required Line Clearance (RLC), and Reduced Required Obstacle Clearance (ROC) alerts are issued when the aircraft flight path is above terrain, yet is projected to come within the minimum clearance values in the FLTA Alert Minimum Terrain and Obstacle Clearance Values table. When an RTC, RLC, and/or a ROC alert is issued, a threat location indicator is displayed on the TAWS Page. Imminent Terrain Impact (ITI), Imminent Line Impact (ILI), and Imminent Obstacle Impact (IOI) alerts are issued when the aircraft is below the elevation of a terrain or obstacle cell in the aircraft’s projected path. ITI, ILI, and IOI alerts are accompanied by a threat location indicator displayed on the TAWS Page. The alert is annunciated when the projected vertical flight path is calculated to come within minimum clearance altitudes in the following table. 190-01007-03-Final.indb 18 7/9/2015 2:07:48 PM
11-19190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexFlight Phase Minimum Clearance Altitude (feet)Level Flight DescendingEn Route 700 500Terminal 350 300Approach 150 100Departure 100 100Table 11-7 FLTA Alert Minimum Terrain and Obstacle Clearance ValuesDuring final approach, FLTA alerts are automatically inhibited when the aircraft is below 200 feet AGL while within 0.5 NM of the approach runway or below 125 feet AGL while within 1.0 NM of the runway threshold. 11.4.8.4 Premature Descent AlertingA Premature Descent Alert (PDA) is issued when the system detects that the aircraft is significantly below the normal approach path to a runway. PDA alerting begins when the aircraft is within 15 NM of the destination airport and ends when the aircraft is either 0.5 NM from the runway threshold or is at an altitude of 125 feet AGL while within 1.0 NM of the threshold. During the final descent, algorithms set a threshold for alerting based on speed, distance, and other parameters. (EIGHT!BOVE4ERRAIN&EET$ISTANCE&ROM$ESTINATION!IRPORTNM               0$!!LERTING!REA0$!!LERTING!REA2UNWAY4HRESHOLDFigure 11-13 PDA Alerting ThresholdPDA and FLTA aural and visual alerts can be manually inhibited. Discretion should be used when inhibiting TAWS and the system should be enabled when appropriate. When TAWS is inhibited, the alert annunciation “TER INHB” is shown. 190-01007-03-Final.indb 19 7/9/2015 2:07:48 PM
11-20Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.4.8.5 Inhibiting/Enabling TAWS-B PDA/FLTA AlertingTAWS also has an inhibit mode that deactivates the PDA/FLTA aural and visual alerts. Pilots should use discretion when inhibiting TAWS and always remember to enable the system when appropriate. Only the PDA and FLTA alerts are disabled in the inhibit mode. After cycling power, TAWS will no longer be inhibited. Touch To Toggle TAWS Inhibit. TAWS Inhibited shown. Terrain (TAWS) Inhibited AnnunciationFigure 11-14 TAWS-B Alerting Disabled (TAWS Inhibited) Annunciation 1. While viewing the Terrain page, touch the Menu key. 2. Touch the TAWS Inhibit key to inhibit or enable TAWS (choice dependent on current state). A green bar in the key indicates the TAWS is inhibited. 11.4.8.6 Negative Climb Rate After Take-Off Alert (NCR)The Negative Climb Rate (NCR) After Take-Off alert (also referred to as “Altitude Loss After Take-Off”) provides alerts when the system determines the aircraft is losing altitude (closing upon terrain) after takeoff. The aural message “Don’t Sink” is given for NCR alerts, accompanied by an annunciation and a pop-up terrain alert on the display. NCR alerting is only active when departing from an airport and when the following conditions are met: • Height above the terrain is less than 700 feet• Distance from the departure airport is 2 NM or less• Heading change from the departure heading is less than 110ºThe NCR alerting parameters as defined by TSO-C151c are shown below. 190-01007-03-Final.indb 20 7/9/2015 2:07:48 PM
11-21190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexAltitude Loss (Feet)Height Above Terrain (Feet)“DON’T SINK”or“TOO LOW, TERRAIN”Figure 11-15 Negative Climb Rate (NCR) Altitude LossSink Rate (FPM)Height Above Terrain (Feet)“DON’T SINK”or“TOO LOW, TERRAIN”Figure 11-16 Negative Climb Rate (NCR) Sink Rate190-01007-03-Final.indb 21 7/9/2015 2:07:49 PM
11-22Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.4.8.7 Altitude Voice Call Out (VCO)TAWS-B provides aural advisory alerts as the aircraft descends, beginning at 500 feet above the terrain, as determined by the radar altimeter (if greater than 5 NM from the nearest airport) or 500 feet above the nearest runway threshold elevation (if less than 5 NM from the nearest airport). Upon descent to this altitude, TAWS-B issues the aural alert message “Five-hundred”. 11.4.8.8 TAWS-B Not Available AlertTAWS-B requires a 3-D GPS position solution along with specific vertical accuracy minimums. Should the position solution become degraded or if the aircraft is out of the database coverage area, the annunciation “TAWS N/A” is generated in the annunciation window and on the TAWS-B page. The aural message “TAWS Not Available” is generated. When the GPS signal is re-established and the aircraft is within the database coverage area, the aural message “TAWS Available” is generated (when the aircraft is airborne). 11.4.8.9 TAWS-B Failure AlertTAWS-B continually monitors several system-critical items such as database validity, hardware status, and GPS status. If the terrain/obstacle database is not available, the aural message “TAWS System Failure” is generated along with a “TAWS FAIL” annunciation. 11.4.9 TAWS-B System StatusDuring power-up, TAWS-B conducts a self-test of its aural and visual annunciations. The system test can also be manually initiated. An aural alert is issued at test completion. TAWS System Testing is disabled when ground speed exceeds 30 knots. Alert Type Alert Annunciation Aural MessageTAWS Available None “TAWS Available”TAWS System Test in Progress NoneTAWS System Test Pass None “TAWS System Test OK”TAWS N/A TAWS Not AvailableTAWS Alerting is Disabled NoneTAWS System Test Fail “TAWS System Failure”Table 11-8 TAWS-B System Test Status Annunciations190-01007-03-Final.indb 22 7/9/2015 2:07:49 PM
11-23190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.5 HTAWS (Optional)11.5.1 Introduction NOTE: TERRAIN, TAWS, HTAWS, or HTERRAIN PROXIMITY functionality will be available via the Terrain page, depending on the installed hardware and configuration. HTAWS or HTERRAIN PROXIMITY are available in software version 4.00, or later. 11.5.1.1 OverviewGarmin’s Helicopter Terrain Awareness Warning System (HTAWS) is an optional feature to increase situational awareness and aid in reducing controlled flight into terrain. Garmin HTAWS is TSO-C194 authorized. Units installed in helicopters that do not have HTAWS installed will display HTerrain Proximity. This is noted by the five color terrain scale which is appropriate to the low altitude operating environment for helicopters. HTAWS provides visual and aural annunciations when terrain and obstacles are a hazard to the aircraft. HTAWS Relative Terrain DepictionRotorcraft OwnshipFigure 11-17 Map Page with Terrain NOTE: HTAWS-enabled units can be identified by going to the Terrain page and checking the lower right-corner for “HTAWS.” 11.5.1.2 Operating CriteriaGarmin HTAWS requires the following to operate properly: • The system must have a valid 3D GPS position solution • The system must have a valid terrain/obstacle database. 190-01007-03-Final.indb 23 7/9/2015 2:07:49 PM
11-24Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.5.1.3 Limitations NOTE: The data contained in the terrain and obstacle databases comes from government agencies. Garmin accurately processes and cross-validates the data, but cannot guarantee the accuracy and completeness of the data. HTAWS displays terrain and obstructions relative to the flight path of the aircraft. Individual obstructions may be shown if available in the database. However, all obstructions may not be available in the database and data may be inaccurate. Never use this information for navigation. NOTE: Terrain databases do not consistently represent foliage. Some trees may extend above HTAWS protection limits in some operating modes. Terrain information is based on terrain elevation data contained in a database that may contain inaccuracies. Terrain information should be used as an aid to situational awareness. Never use it for navigation or to maneuver to avoid terrain. HTAWS uses terrain and obstacle information supplied by government sources. The data undergoes verification by Garmin to confirm accuracy of the content. However, the displayed information should never be understood as being all-inclusive. 11.5.2 HTAWS Operation11.5.2.1 HTAWS AlertingHTAWS uses information provided from the GPS receiver to provide a horizontal position and altitude. GPS altitude is derived from satellite measurements. GPS altitude is converted to a mean sea level (MSL)-based altitude (GSL altitude) and is used to determine HTAWS alerts. GSL altitude accuracy is affected by factors such as satellite geometry, but it is not subject to variations in pressure and temperature that normally affect pressure altitude devices. GSL altitude does not require local altimeter settings to determine MSL altitude. Therefore, GPS altitude provides a highly accurate and reliable MSL altitude source to calculate terrain and obstacle alerts. HTAWS utilizes terrain and obstacle databases that are referenced to mean sea level (MSL). Using the GPS position and GSL altitude, HTAWS displays a 2-D picture of the surrounding terrain and obstacles relative to the position and 190-01007-03-Final.indb 24 7/9/2015 2:07:49 PM
11-25190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexaltitude of the aircraft. The GPS position and GSL altitude are used to calculate and “predict” the aircraft’s flight path in relation to the surrounding terrain and obstacles. In this manner, HTAWS can provide advanced alerts of predicted dangerous terrain conditions. Detailed alert modes are described later in this section. 11.5.2.2 Power UpDuring power-up of the unit, the terrain/obstacle database versions are displayed along with a disclaimer to the pilot. At the same time, HTAWS self-test begins. HTAWS gives the following aural messages upon test completion: • “HTAWS System Test, OK”, if the system passes the test• “HTAWS System Failure”, if the system fails the testA test failure is also annunciated visually for HTAWS, as shown in the HTAWS Alert Summary table. 11.5.3 HTAWS PageHTAWS is shown on the Terrain page when HTAWS is available. Relative Terrain Elevation depictionRotorcraft Ownship120º Arc ViewHTAWS AnnunciationIcon shows wire obstacle overlay is active (software version 5.12, or later)Icon shows point obstacle overlay is active (software version 5.12, or later)Figure 11-18 Terrain/HTAWS PageTerrain information, aircraft ground track, and GPS-derived MSL altitude are displayed on the page. The “GSL” above altitude display in the top right corner of the display reminds the pilot that altitude is GPS-derived. 190-01007-03-Final.indb 25 7/9/2015 2:07:49 PM
11-26Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex The HTAWS page menu provides options to acknowledge caution alerts, reduce protection, or inhibit alerting. Figure 11-19 HTAWS Terrain Menu11.5.3.1 View SelectionThe HTAWS Page has two selectable view settings: HTAWS Terrain Colorization OverlayRotorcraft OwnshipTerrain Legend360º ViewObstacle Legend (software version 6.00, or later)Figure 11-20 Terrain Page with HTAWS - 360° View• 360˚ View—View from above aircraft depicting surrounding terrain on all sides. • Arc (120˚) View—View of terrain ahead of and 60˚ to either side of the aircraft flight path. NOTE: If a heading source is available the HTAWS page will be oriented heading up. If no heading source is available the HTAWS page will be oriented track up. 1. While viewing the Terrain/HTAWS Page, touch MENU. Touch Arc or 360˚. 190-01007-03-Final.indb 26 7/9/2015 2:07:50 PM
11-27190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex 2. Touch Back to return to the Terrain/HTAWS display. The HTAWS Page displays the selected view. Repeat step 1 to select the alternate view, and touch Back. 11.5.3.2 HTAWS InhibitHTAWS provides an “inhibit mode.” This mode deactivates aural and visual alerts when they are deemed unnecessary by the aircrew. Pilots should use discretion when inhibiting the HTAWS system and always remember to enable the system when appropriate. VCO’s are not inhibited in Inhibit Mode. See section 3 for more information on HTAWS alerts. When alerting is inhibited, all FLTA aural and visual alerting is suppressed. HTAWS should only be inhibited when in visual contact with terrain and when the pilot can be assured of maintaining clearance from terrain and obstacles. When conducting en route operations and operations from published airports and heliports, HTAWS should be operated in Normal mode. HTAWS configured units will always start up with HTAWS alerts uninhibited. To inhibit HTAWS alerts: 1. While viewing the Terrain/HTAWS page, touch MENU. 2. Touch HTAWS Inhibit. The green bar will show when HTAWS Inhibit is active. 3. Touch Back to return to the Terrain/HTAWS display. The HTAWS alerts are inhibited. The annunciation is displayed in the terrain annunciator field whenever HTAWS is inhibited. NOTE: When the ground speed is less than 30 knots HTAWS will automatically display the “HTAWS INHB” annunciation. This indicates that HTAWS is no longer providing protection. This automatic “TAWS INHB” cannot be removed by menu option selection. Menu selections for INHIBIT HTAWS and RP Mode remain available when HTAWS is automatically inhibited due to groundspeed. If the pilot selects a mode on the menu while HTAWS is auto inhibited because it is less than 30 knots then the unit will enter that mode once ground speed exceeds 30 knots. Hence, the presence of these selections on the Menu. 190-01007-03-Final.indb 27 7/9/2015 2:07:50 PM
11-28Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.5.3.3 External HTAWS Inhibit ControlAn optional installation is allowed for providing an external HTAWS Inhibit switch. Touching the external HTAWS Inhibit switch toggles the HTAWS inhibit on and off in the same manner as using the Terrain Menu selection. 11.5.3.4 Reduced Protection ModeThe Reduce Protection (RP) functionality allows operating with a reduction in the alerting thresholds, and suppresses visual and aural annunciation of caution alerts. Reduced protection allows low level operations and landings off airport with a minimum number of alerts while continuing to provide protection from terrain and obstacles. Reduced Protection should only be selected when operating in visual contact with the terrain as alerting times are significantly less than in normal mode. There is support for an external RP Mode switch and an external Alert Acknowledge switch. To toggle protection: 1. While viewing the Terrain/HTAWS Page, touch MENU. 2. Touch the RP Mode key to toggle the RP mode on and off. The green bar will show when RP mode is active. 3. Touch Back to return to the Terrain/HTAWS display. The “RP Mode” annunciation is displayed in the terrain annunciator field and in the lower right corner of the terrain page whenever protection is reduced. 190-01007-03-Final.indb 28 7/9/2015 2:07:50 PM
11-29190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.5.3.5 HTAWS Manual TestGarmin HTAWS provides a manual test capability which verifies the proper operation of the aural and visual annunciations of the system prior to a flight. To manually test the HTAWS system: 1. While viewing the Terrain/HTAWS Page, touch MENU. 2. Touch the Test HTAWS key. 3. Touch Back to return to the Terrain/HTAWS display. An aural message is played giving the test results: • “HTAWS System Test, OK” if the system passes the test • “HTAWS System Failure” if the system fails the test NOTE: HTAWS System Testing is disabled when in the air so as not to impede HTAWS alerting. 11.5.3.6 HTAWS Legend 1. While viewing the Terrain/HTAWS page, touch MENU. 2. Touch the Legend key to toggle the legend on or off. The green bar will show when the Legend is active. 3. Touch Back to return to the Terrain/HTAWS display. Figure 11-21 HTAWS Terrain and Obstacle Legend190-01007-03-Final.indb 29 7/9/2015 2:07:50 PM
11-30Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexColor DescriptionRed Terrain is more than 250 ft above the aircraft. Orange Terrain is between 0 ft and 250 ft above the aircraft.Yellow Terrain is between 250 ft and 0 ft below the aircraft. Green Terrain is between 250 ft and 500 ft below the aircraft. Black Terrain is more than 500 ft below the aircraft. Table 11-9 HTAWS Terrain Altitude Color DescriptionTerrain more than 500 ft below the aircraft altitudeTerrain is between 0 ft and 250 ft below the aircraft altitudeTerrain is more than 250 ft above the aircraft altitudeTerrain is between 250 ft and 0 ft above the aircraft altitudeAircraft Altitude -250 ft Terrain is between 250 ft and 500 ft below the aircraft altitudeAircraft Altitude +250 ft Aircraft Altitude -500 ft Aircraft AltitudeRedOrangeYellowGreenBlackFigure 11-22 HTAWS Terrain Altitude Colors190-01007-03-Final.indb 30 7/9/2015 2:07:50 PM
11-31190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.5.3.7 Flight Plan Overlay 1. While viewing the Terrain/HTAWS page, touch MENU. 2. Touch the Flight Plan key to toggle the overlay of the active flight plan on or off. The green bar will show when the Flight Plan overlay is shown. 3. Touch Back to return to the Terrain/HTAWS display. 11.5.4 HTAWS SymbolsThe symbols and colors in the following figures and table are used to represent obstacles and the location of terrain threats on the HTAWS Page. Each color is associated with a height above terrain. Obstacles are ALWAYS shown on the TAWS page at 10 NM and below. NOTE: If an obstacle or terrain cell and the projected flight path of the aircraft intersect, the display automatically zooms in to the closest threat location on the HTAWS Page. Tower Windmill Windmill in Group Power LineTable 11-10 Obstacle Icon TypesGrouped obstacles are shown with an asterisk (as shown in the Windmill in Group example above). The color of the asterisks is tied to the relative altitude of the highest obstacle in the group, not other obstacles within that group. Obstacles are grouped when they would otherwise overlap. 190-01007-03-Final.indb 31 7/9/2015 2:07:50 PM
11-32Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexUnlighted Obstacle Lighted ObstacleObstacle Color Obstacle Location< 1000 ft AGL> 1000 ft AGL< 1000 ft AGL> 1000 ft AGLObstacle SymbolRedObstacle is at or above current aircraft altitudeYellowObstacle is between 250 ft and 0 ft below current aircraft altitudeWhiteObstacle is 250 ft, or more, below current aircraft altitude. Obstacles are removed when more than 500 ft below the helicopter. Table 11-11 HTAWS Obstacle Colors and SymbologyObstacle is at or above the aircraft altitude (Red) 250 ft Obstacle is between 250 ft and 0 ft below the aircraft altitude (Yellow)Obstacle is 250 ft, or more, below the aircraft altitude (White)Figure 11-23 HTAWS Obstacle Altitude Colors and SymbologyThreat Location Indicator Alert LevelWARNING (Red)CAUTION (Yellow)Table 11-12 HTAWS Alert Coloring and Symbology190-01007-03-Final.indb 32 7/9/2015 2:07:51 PM
11-33190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.5.5 HTAWS AlertsAlerts are issued when flight conditions meet parameters that are set within HTAWS software algorithms. HTAWS alerts employ either a CAUTION or a WARNING alert severity level. When an alert is issued, visual annunciations are displayed. Aural alerts are simultaneously issued. Annunciations appear in a dedicated field in the lower left corner of the display. Annunciations are color-coded according to the HTAWS Alert Summary table. Pop-up terrain alerts will occur if an HTAWS alert is activated while not on the HTAWS page. There are two options when an alert is displayed: To acknowledge the pop-up alert and return to the currently viewed page: Touch the Close key. To acknowledge the pop-up alert and quickly access the HTAWS Page: Touch the ENT key. NOTE: To further capture the attention of the pilot, HTAWS issues aural (voice) messages that accompany visual annunciations and pop-up alerts. For a summary of aural messages, see the HTAWS Alert Summary table. NOTE: HTAWS Caution Alerts are displayed as constant black text on a yellow background; HTAWS Warning Alerts are displayed as constant white text on a red background. 11.5.5.1 Forward Looking Terrain AvoidanceThe unit will issue terrain alerts not only when the aircraft altitude is below the terrain elevation but also when the aircraft is projected to come within minimum clearance values of the terrain. This alerting, called Forward Looking Terrain Avoidance (FLTA), is also provided for obstacles. The FLTA functionality looks ahead of the aircraft using GPS position information and the terrain and obstacle databases to provide alerts when the predicted flight path does not clear the terrain or obstacle by the required clearance. The amount of clearance required varies depending on position relative to airports and heliports, in order to reduce the occurrence of nuisance alerting. Any threat locations are depicted on the display. There are 2 levels of severity for FLTA alerts. They are cautionary (amber) and warning (red) in nature and are described in further detail below. 190-01007-03-Final.indb 33 7/9/2015 2:07:51 PM
11-34Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexFLTA CAUTION—Estimated potential impact in approximately 30 seconds after a caution pop-up alert and annunciation. FLTA caution alerts are accompanied by the aural message “Caution Terrain; Caution Terrain”. Similarly, a “Caution Obstacle; Caution Obstacle” alert is also provided. The time to an alert can vary with conditions, therefore there is no guarantee of a 30 second caution alert being issued. FLTA WARNING— Warning pop-up alerts are issued 15 seconds prior to an estimated potential impact in normal mode and approximately 10 seconds in RP Mode. FLTA warning alerts are accompanied by the aural message “Warning - Terrain, Terrain” . Similarly, a “Warning - Obstacle, Obstacle” alert is also provided. The time to an alert can vary with conditions, therefore there is no guarantee of a 15/10 second warning alert being issued. The alerts are annunciated visually through the annunciator status bar, a pop-up alert box, and the red and yellow areas on the HTAWS page. The alerts are annunciated aurally through a voice message indicating the potential threat, such as “Caution - Terrain, Terrain” or “Warning - Obstacle, Obstacle”. 11.5.5.2 HTAWS Voice Call Out Aural AlertThe purpose of the Voice Call Out (VCO) aural alert messages are to provide an advisory alert to the pilot that the aircraft is between 500 feet and 100 feet above terrain in 100 foot increments. When the aircraft descends within the selected distance from the terrain, the aural message for the selected height above terrain is generated. There are no display annunciations or pop-up alerts that accompany the aural message. HTAWS allows an additional 50 foot VCO alert with radar altimeter input. 190-01007-03-Final.indb 34 7/9/2015 2:07:51 PM
11-35190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.5.5.3 HTAWS Voice Call Out SelectionThe Voice Call Out (VCO) selection is available when HTAWS is installed. The VCO functionality provides a voice annunciation of the aircraft’s height above terrain or the nearest airport, heliport, runway, or helipad when that threshold is first crossed. The available call outs include “Five Hundred” through “One Hundred” in one hundred foot intervals. The voice call outs can be enabled and disabled through the Voice Call Outs Selection option on the System - Audio page. NOTE: VCOs are available down to 100 feet above terrain when HTAWS is installed and use GSL above terrain to generate call outs (no radar altimeter required). If a radar altimeter is interfaced to the GTN, alerts are available down to 50 feet and the height above terrain when the radar altimeter is used to generate the callouts. To select the Voice Call Out choices in the System - Audio page, select the Voice Call Out Selection item and then select the desired value. 1. From the Main page, touch System and then Audio. 2. Touch the Voice Callouts key to view the Voice Call Outs page. Touch To View Maximum Voice Call OutsAudio Volume Bar GraphTouch To Adjust Audio VolumeTouch To Select Alert VoiceAudio Volume Numeric ValueFigure 11-24 Select Voice Call Outs from the System Audio Page190-01007-03-Final.indb 35 7/9/2015 2:07:52 PM
11-36Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex 3. Touch the MAX Voice Callout key to select the Voice Call Outs. Maximum Voice Call Out Range - None SelectedTouch To Set Maximum Voice Call Out RangeFigure 11-25 View the Maximum Voice Call Out Range (None Selected) 4. The values above the selected value will be disabled (Off). Maximum Voice Call Out Range - 200 feet SelectedTouch To Set Maximum Voice Call Out Range -200 ft SelectedFigure 11-26 View the Maximum Voice Call Out Range (200 ft Selected)190-01007-03-Final.indb 36 7/9/2015 2:07:52 PM
11-37190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.5.5.4 HTAWS Not Available AlertGarmin HTAWS requires a 3-D GPS navigation solution along with specific vertical accuracy minimums. Should the navigation solution become degraded, or if the aircraft is out of the database coverage area, the annunciation “HTAWS N/A” is shown in the annunciation window. When the GPS signal is re-established and the aircraft is within the database coverage area, the “HTAWS N/A” annunciation is removed. 11.5.5.5 HTAWS Failure AlertHTAWS continually monitors several system-critical items, such as database validity, hardware status, and GPS status. If the terrain/obstacle database is not available, the aural message “HTAWS System Failure” is issued along with the “HTAWS FAIL” annunciation. 11.5.5.6 HTAWS Alert SummaryThe aural alert voice gender is configurable to be either male or female. See your Garmin installer for further information on configuring the alert system. HTAWSAnnunciation Pop-Up Alert Aural Message DescriptionNone “HTAWS System Failure” HTAWS has failedNone None HTAWS has been inhibited by the crew, or the aircraft ground-speed is below 30 knots (automatic inhibiting). None “HTAWS Not Available” HTAWS not available. “Caution - Terrain, Terrain” Forward Looking Terrain Avoidance Caution for Terrain“Warning - Terrain, Terrain” Forward Looking Terrain Avoidance Warning for Terrain190-01007-03-Final.indb 37 7/9/2015 2:07:52 PM
11-38Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexHTAWSAnnunciation Pop-Up Alert Aural Message Description“Caution - Obstacle, Obstacle”Forward Looking Terrain Avoidance Caution for Obstacle“Warning - Obstacle, Obstacle”Forward Looking Terrain Avoidance Warning for ObstacleNone NoneAlerting thresholds are reduced. Visual and aural annunciation of caution alerts are suppressed. “Wire Ahead” Forward Looking Terrain Avoidance Caution for Wire. "Wire Ahead Pull Up, Wire Ahead Pull Up"Forward Looking Terrain Avoidance Warning for Power LinesNone None “Five Hundred”“Four Hundred”“Three Hundred”“Two Hundred”“One Hundred”"Fifty"HTAWS provides optional 500 ft through 100 ft (in 100 ft increments) altitude call out alerts. An additional value of 50 ft is available if a radar altimeter is installed. Table 11-13 HTAWS Alert Summary NOTE: HTAWS Caution Alerts are displayed as constant black text on a yellow background; HTAWS Warning Alerts are displayed as constant white text on a red background. 190-01007-03-Final.indb 38 7/9/2015 2:07:53 PM
11-39190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.5.6 Pilot ActionsIf an HTAWS warning and associated aural are received, the pilot should immediately maneuver the rotorcraft in response to the alert unless the terrain or obstacle is clearly identified visually and determined by the pilot not to be a factor to the safety of the operation. A HTAWS caution alert indicates terrain or obstacle nearby. If possible visually locate the terrain or obstacle for avoidance. A HTAWS warning alert may follow a HTAWS caution unless the aircraft’s path towards the terrain or obstacle is changed. NOTE: Display of terrain and obstacles on the display is supplemental data only. Maneuvering solely by reference to the terrain and obstacle data is not recommended or authorized. 190-01007-03-Final.indb 39 7/9/2015 2:07:53 PM
11-40Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.6 TAWS-A (Optional)11.6.1 Introduction NOTE: TERRAIN, TAWS-A, TAWS-B, HTAWS, or HTERRAIN PROXIMITY functionality will be available via the Terrain page, depending on the installed hardware and configuration. HTAWS or HTERRAIN PROXIMITY are available in software version 4.00, or later. TAWS-A is available in software version 5.00, or later. NOTE: The data contained in the TAWS databases comes from government agencies. Garmin accurately processes and cross-validates the data but cannot guarantee the accuracy and completeness of the data. TAWS-A (Terrain Awareness and Warning System - Class A) is an optional feature to increase situational awareness and aid in reducing controlled flight into terrain (CFIT). TAWS-A provides visual and aural annunciations when terrain and obstacles are within the given altitude threshold from the aircraft. TAWS-A satisfies TSO-C151c Class A and TSO-92c requirements for certification. Class A TAWS requires the following components and will not work properly without them: • A valid terrain/obstacle/airport terrain database• A valid 3-D GPS position solution• Valid flap and landing gear status inputs• A valid radar altimeterTAWS-A uses terrain and obstacle information supplied by government sources. Terrain information is based on terrain elevation information in a database that may contain inaccuracies. Individual obstructions may be shown if available in the database. The data undergoes verification by Garmin to confirm accuracy of the content, per TSO-C151c. However, the displayed information should never be understood as being all-inclusive and data may be inaccurate. TAWS-A uses information from the GPS receiver to provide a horizontal position and altitude, along with additional altitude input from the radar altimeter. GPS altitude is derived from satellite measurements. GPS altitude is then converted to a height above geodetic sea level (GSL), which is the height above mean sea level (MSL) calculated geometrically. GSL altitude accuracy is 190-01007-03-Final.indb 40 7/9/2015 2:07:53 PM
11-41190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexaffected by factors such as satellite geometry, but it is not subject to variations in pressure and temperature that normally affect pressure altitude devices. GSL altitude does not require local altimeter settings to determine MSL altitude. Therefore, GSL altitude provides a highly accurate and reliable MSL altitude source to calculate terrain and obstacle alerts. The terrain and obstacle databases used by TAWS-A are referenced to mean sea level (MSL). Using the GPS position and GSL altitude, TAWS-A displays a 2-D picture of the surrounding terrain and obstacles relative to the position and altitude of the aircraft. Furthermore, the GPS position and GSL altitude are used to calculate and “predict” the aircraft’s flight path in relation to the surrounding terrain and obstacles. In this manner, TAWS-A can provide advanced alerts of predicted dangerous terrain conditions. Class A TAWS incorporates radar altimeter input with the GSL altitude to provide a more accurate position reference when at lower altitudes for certain alert types, and to retain a level of ground proximity warning capability in the unlikely event of an airport, terrain or obstacle database failure. Baro-corrected altitude (or indicated altitude) is derived by adjusting the altimeter setting for local atmospheric conditions. The most accurate baro-corrected altitude can be achieved by frequently updating the altimeter setting to the nearest reporting station along the flight path. However, because actual atmospheric conditions seldom match the standard conditions defined by the International Standard Atmosphere (ISA) model (where pressure, temperature, and lapse rates have fixed values), it is common for the baro-corrected altitude (as read from the altimeter) to differ from the GPS-MSL altitude. This variation results in the aircraft’s true altitude differing from the baro-corrected altitude. TAWS-A provides the following alert types: • Forward Looking Terrain Avoidance (FLTA) Alerting, which consists of: - Required Terrain Clearance (RTC) / Required Line Clearance (RLC) / Required Obstacle Clearance (ROC) Alerting- Imminent Terrain Impact (ITI) / Imminent Line Impact (ILI) /Imminent Obstacle Impact (IOI) Alerting• Premature Descent Alerting (PDA)• Ground Proximity Warning System (GPWS) Alerting, which consists of: - Excessive Descent Rate (EDR) Alerting190-01007-03-Final.indb 41 7/9/2015 2:07:53 PM
11-42Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex- Excessive Closure Rate (ECR) to Terrain Alerting- Flight Into Terrain (FIT) Alerting- Negative Climb Rate (NCR) after takeoff Alerting- Excessive below Glideslope/Glidepath Deviation (GSD) Alerting- Altitude Voice Call Out (VCO) Alerting11.6.1.1 Displaying TAWS-A DataTAWS-A uses yellow (caution) and red (warning) to depict terrain and obstacle (with a height greater than 200 feet above ground level, AGL) alerts relative to aircraft altitude. Depictions of obstacles more than 200 feet below the aircraft are removed. Colors are adjusted automatically as the aircraft altitude changes. The colors and symbols in Figure 11-28 and Tables 11-11 and 11-12 are used to represent terrain, obstacles, and threat locations. Threat LocationUnlighted ObstacleProjected Flight Path1000 ft 100 ft Threshold Terrain more than 1000 ft below the aircraft altitude (Black)Terrain between 100 ft and 1000 ft below the aircraft altitude (Yellow)Terrain above or within 100 ft below the aircraftaltitude (Red) Figure 11-27 Terrain Altitude/Color Correlation for TAWS-AAlert Level Annunciator Text Threat Location IndicatorExample Visual AnnunciationWarning White text on red backgroundCaution Black text on yellow backgroundInformational Black text on white backgroundNot ApplicableTable 11-14 TAWS-A Alert Colors and SymbologyTower Windmill Windmill in Group Power LineTable 11-15 Obstacle Icon Types190-01007-03-Final.indb 42 7/9/2015 2:07:53 PM
11-43190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexGrouped obstacles are shown with an asterisk (as shown in the Windmill in Group example above). The color of the asterisks is tied to the relative altitude of the highest obstacle in the group, not other obstacles within that group. Obstacles are grouped when they would otherwise overlap. Unlighted Obstacle Lighted Obstacle Threat Location Indicator Terrain ColorTerrain/Obstacle LocationAlert Level< 1000 ft AGL> 1000 ft AGL< 1000 ft AGL> 1000 ft AGLObstacle SymbolRedTerrain/Obstacle above or within 100 ft below current aircraft altitudeWARNING (Red)YellowTerrain/Obstacle between 100 ft and 1000 ft below current aircraft altitudeCAUTION (Yellow)Table 11-16 TAWS-A Terrain/Obstacle Colors and Symbology11.6.2 TAWS-A DisplayThe TAWS-A Page shows terrain, obstacle, and threat location data in relation to the aircraft’s current altitude, without clutter from the basemap. Aviation data (airports, VORs, and other NAVAIDs) can be displayed for reference. If an obstacle and the projected flight path of the aircraft intersect, the display automatically zooms in to the closest potential point of impact on the TAWS-A Page. Aircraft orientation on this map is always heading up unless there is no valid heading. Two views are available relative to the position of the aircraft: the 360° default display and the radar-like ARC (120°) display. Map range is adjustable with the In and Out keys from 1 to 200 NM, as indicated by the map range rings (or arcs). 190-01007-03-Final.indb 43 7/9/2015 2:07:53 PM
11-44Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexTrack AnnunciationOwnship PositionAircraft GSL Value(GPS Derived)Range ArcOstacle Legend (software version 6.00, or later)Terrain Page TitleRed Terrain Is Above Or Within 100 ft Below The Aircraft AltitudeYellow Terrain Is Between 100 ft and 1000 ft Below The Aircraft AltitudeTerrain TypeTerrain LegendFigure 11-28 TAWS-A Page with Arc ViewHeading AnnunciationOwnship PositionAircraft GSL Value(GPS Derived)TAWS Annunciations(shown on all displays)(+ indicates there are more annunciations and will show each one for five seconds)Terrain Page TitleRed Terrain Is Above Or Within 100 ft Below The Aircraft AltitudeYellow Terrain Is Between 100 ft and 1000 ft Below The Aircraft AltitudeTerrain TypeTAWS Annunciations (all annunciations shown on Terrain page)Range ArcsAn Asterisk Indicates Grouped ObstaclesLighted Tower ObstacleLighted Windmill ObstacleFigure 11-29 TAWS-A Page with 360° View190-01007-03-Final.indb 44 7/9/2015 2:07:53 PM
11-45190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex 1. While viewing the Terrain page, touch the Menu key. 2. Selections are grouped by function: View, Layers, and TAWS. Selected View Flight Plan Selected To ShowTerrain and Obstacle Legend Selected To ShowTest TAWS - Only Available on GroundFlap Override SelectionTAWS Alerts InhibitGround Proximity Warning System InhibitGlideslope Alert InhibitFigure 11-30 TAWS-A Menu360ArcViewFlight PlanLegendLayersFlap OverrideG/S InhibitGPWS InhibitTAWS InhibitTest TAWSTAWSFigure 11-31 TAWS-A Page Functional Diagram190-01007-03-Final.indb 45 7/9/2015 2:07:54 PM
11-46Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.6.3 TAWS-A AlertsAlerts are issued when flight conditions meet parameters that are set within TAWS-A software algorithms. TAWS-A alerts employ a CAUTION or a WARNING alert severity level. When an alert is issued, visual annunciations are displayed and aural alerts are simultaneously issued. TAWS-A alert types with corresponding annunciations and aural messages are shown in Table 11-13. When an alert is issued, annunciations appear on the display. The TAWS-A Alert Annunciation is shown on the lower left part of the display. If the TAWS-A Page is not already displayed, a pop-up alert appears while an alert is active. Blinking AlertTouch To Display Terrain PageTouch To Remove Pop-Up And Remain On Current PageTerrain WarningTAWS AnnunciationFigure 11-32 Terrain Alert Pop-UpTo acknowledge the pop-up alert: Touch the Close key (returns to the currently viewed page), or Touch the Go to Terrain key (accesses the TAWS-A Page)190-01007-03-Final.indb 46 7/9/2015 2:07:54 PM
11-47190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.6.3.1 TAWS-A Alerts SummaryAlert Type AlertAnnunciationPop-Up Alert(Except TAWS-A Page)Aural MessageReduced Required Terrain Clearance Warning (RTC)*or“Terrain, Terrain; Pull Up, Pull Up” *or“Terrain Ahead, Pull Up; Terrain Ahead, Pull Up”Imminent Terrain Impact Warning (ITI) *or“Terrain, Terrain; Pull Up, Pull Up”*or"Terrain Ahead, Pull Up; Terrain Ahead, Pull Up”Reduced Required Obstacle Clearance Warning (ROC)*or“Obstacle, Ob-stacle; Pull Up, Pull Up”*or“Obstacle Ahead, Pull Up; Obstacle Ahead, Pull Up”Imminent Obstacle Impact Warning (IOI) *or“Obstacle, Ob-stacle; Pull Up, Pull Up”*or“Obstacle Ahead, Pull Up; Obstacle Ahead, Pull Up”Excessive Descent Rate Warning (EDR)“<whoop> <whoop> Pull Up”Excessive Closure Rate Warning (ECR)“<whoop> <whoop> Pull Up”Imminent Line Impact Warning (ILI)"Wire Ahead, Pull Up; Wire Ahead, Pull Up"or"Wire, Wire; Pull Up, Pull Up"190-01007-03-Final.indb 47 7/9/2015 2:07:54 PM
11-48Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexAlert Type AlertAnnunciationPop-Up Alert(Except TAWS-A Page)Aural MessageReduced Line Clearance Warning (RLC)"Wire Ahead, Pull Up; Wire Ahead, Pull Up"or"Wire, Wire; Pull Up, Pull Up"Reduced Required Terrain Clearance Caution (RTC)*or“Caution, Terrain; Caution, Terrain”*or“Terrain Ahead; Terrain Ahead”Imminent Terrain Impact Caution (ITI) *or“Caution, Terrain; Caution, Terrain”or“Terrain Ahead; Terrain Ahead”Reduced Required Obstacle Clearance Caution (ROC)*or“Caution, Obstacle; Caution, Obstacle”*or“Obstacle Ahead; Obstacle Ahead”Imminent Obstacle Impact Caution (IOI)*or“Obstacle Ahead; Obstacle Ahead”*or“Caution, Obstacle; Caution, Obstacle”Imminent Line Impact Caution (ILI)"Wire Ahead; Wire Ahead"* or "Caution, Wire; Caution, Wire"Reduced Line Clearance Caution (RLC)"Wire Ahead; Wire Ahead"* or "Caution, Wire; Caution, Wire"Premature Descent Alert Caution (PDA)“Too Low, Terrain”190-01007-03-Final.indb 48 7/9/2015 2:07:54 PM
11-49190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexAlert Type AlertAnnunciationPop-Up Alert(Except TAWS-A Page)Aural MessageExcessive Descent Rate Caution (EDR)“Sink Rate”Excessive Closure Rate Caution (ECR)“Terrain, Terrain”Negative Climb Rate Caution (NCR)*or“Don’t Sink”*or“Too Low, Terrain”Flight Into Terrain High Speed Caution (FIT)“Too Low, Terrain”Flight Into Terrain Gear Caution (FIT)“Too Low, Gear”Flight Into Terrain Flaps Caution (FIT)“Too Low, Flaps”Flight Into Terrain Takeoff Caution (FIT)“Too Low, Terrain”Glide Slope Devia-tion Caution (GSD) “Glideslope”Altitude Voice Call Out (VCO) None None“Five-Hundred”, “Four-Hundred”*, “Three-Hundred”*, “Two-Hundred”*, “One-Hundred”*TAWS Available NoneN/A“TAWS Available”TAWS System Test in ProgressN/ANoneTAWS System Test Pass NoneN/A“TAWS System Test OK”TAWS N/AN/ATAWS Not AvailableTAWS Alerting is DisabledN/ANoneTAWS System Test FailN/A“TAWS System Failure”190-01007-03-Final.indb 49 7/9/2015 2:07:55 PM
11-50Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexAlert Type AlertAnnunciationPop-Up Alert(Except TAWS-A Page)Aural MessageIncorrect TAWS configuration, invalid/missing terrain, airport, or obstacle database, or TAWS audio fault.**N/A“TAWS System Failure”No GPS positionN/A“TAWS Not Available”GPS position unavailable/degraded, outside of terrain database coverageN/A“TAWS Not Available”Sufficient GPS signal reception restoredNone N/A“TAWS Available”(aural message only in flight)Incorrect TAWS configuration, radar altimeter unavailable, GPS position unavailable/degraded, TAWS audio fault*N/A“GPWS System Failure”GPWS InhibitN/A“GPWS System Failure”GPWS Not Available. Incorrect TAWS configuration, radar altimeter unavailable, GPS position unavailable/degraded, TAWS audio fault. N/A None190-01007-03-Final.indb 50 7/9/2015 2:07:55 PM
11-51190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexAlert Type AlertAnnunciationPop-Up Alert(Except TAWS-A Page)Aural MessageGlideslope InhibitN/A NoneFLAP OverrideN/A None* Alerts with multiple messages are configurable. Alerts for the default configuration are indicated with asterisks.** VCO alerts are not issued if both TAWS and GPWS systems have failed or are not available† GSD alert will be available if a valid ILS is being used for navigation, even in no valid GPS signal is being received. Table 11-17 TAWS-A Alerts Summary11.6.3.2 Excessive Descent Rate AlertThe purpose of the Excessive Descent Rate (EDR) alert is to provide notification when the aircraft is determined to be descending upon terrain at an excessive rate. The parameters for the alert as defined by TSO-C151c are shown below.    "PULL UP""PULL UP""SINK RATE"$ESCENT2ATEHeight Above Terrain (Feet)Figure 11-33 Excessive Descent Rate Alert Criteria190-01007-03-Final.indb 51 7/9/2015 2:07:55 PM
11-52Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.6.3.3 Forward Looking Terrain AvoidanceReduced Required Terrain Clearance (RTC), Reduced Required Line Clearance (RLC), and Reduced Required Obstacle Clearance (ROC) alerts are issued when the aircraft flight path is above terrain, yet is projected to come within the minimum clearance values in the FLTA Alert Minimum Terrain and Obstacle Clearance Values table. When an RTC, RLC, and/or a ROC alert is issued, a threat location indicator is displayed on the TAWS Page. Imminent Terrain Impact (ITI), Imminent Line Impact (ILI), and Imminent Obstacle Impact (IOI) alerts are issued when the aircraft is below the elevation of a terrain or obstacle cell in the aircraft’s projected path. ITI, ILI, and IOI alerts are accompanied by a threat location indicator displayed on the TAWS Page. The alert is annunciated when the projected vertical flight path is calculated to come within minimum clearance altitudes in the following table. Flight Phase Minimum Clearance Altitude (feet)Level Flight DescendingEn Route 700 500Terminal 350 300Approach 150 100Departure 100 100Table 11-18 FLTA Alert Minimum Terrain and Obstacle Clearance ValuesDuring final approach, FLTA alerts are automatically inhibited when the aircraft is below 200 feet AGL while within 0.5 NM of the approach runway or below 125 feet AGL while within 1.0 NM of the runway threshold. 11.6.3.4 Premature Descent AlertingA Premature Descent Alert (PDA) is issued when the system detects that the aircraft is significantly below the normal approach path to a runway. PDA alerting begins when the aircraft is within 15 NM of the destination airport and ends when the aircraft is either 0.5 NM from the runway threshold or is at an altitude of 125 feet AGL while within 1.0 NM of the threshold. During the final descent, algorithms set a threshold for alerting based on speed, distance, and other parameters. 190-01007-03-Final.indb 52 7/9/2015 2:07:55 PM
11-53190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex(EIGHT!BOVE4ERRAIN&EET$ISTANCE&ROM$ESTINATION!IRPORTNM               0$!!LERTING!REA0$!!LERTING!REA2UNWAY4HRESHOLDFigure 11-34 PDA Alerting ThresholdPDA and FLTA aural and visual alerts can be manually inhibited. Discretion should be used when inhibiting TAWS and the system should be enabled when appropriate. When TAWS is inhibited, the alert annunciation “TER INHB” is shown. 11.6.3.5 Inhibiting/Enabling TAWS-A PDA/FLTA AlertingTAWS-A also has an inhibit mode that deactivates the PDA/FLTA aural and visual alerts. Pilots should use discretion when inhibiting TAWS-A and always remember to enable the system when appropriate. Only the PDA and FLTA alerts are disabled in the inhibit mode. After cycling power, TAWS-A will no longer be inhibited. Touch To Toggle TAWS Inhibit. TAWS Inhibited shown. Terrain (TAWS) Inhibited AnnunciationFigure 11-35 TAWS-A Alerting Disabled (TAWS Inhibited) Annunciation 1. While viewing the Terrain page, touch the Menu key. 2. Touch the TAWS Inhibit key to inhibit or enable TAWS (choice is dependent on current state). A green bar in the key indicates the TAWS is inhibited. 190-01007-03-Final.indb 53 7/9/2015 2:07:55 PM
11-54Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.6.3.6 Excessive Closure Rate AlertThe Excessive Closure Rate (ECR) alert provides suitable notification when the aircraft is determined to be closing upon terrain at an excessive speed for a given aircraft gear and flap configuration. The following figures show the ECR alerting criteria for flaps in the landing configuration and for all other flight phases respectively. ECR alerts are automatically inhibited when the aircraft is 5 NM from the nearest airport, except when FLTA is not available (causing the TAWS N/A or TAWS FAIL annunciation to be displayed), in which case ECR alerting will remain active until landing. Height Above Terrain (Feet)Closure Rate (FPM)Figure 11-36 Excessive Closure Rate Alert Criteria (Flaps Up or Takeoff Configuration)190-01007-03-Final.indb 54 7/9/2015 2:07:56 PM
11-55190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexHeight Above Terrain (Feet)Closure Rate (FPM)Figure 11-37 Excessive Closure Rate Alert Criteria (Flaps in Landing Configuration)190-01007-03-Final.indb 55 7/9/2015 2:07:57 PM
11-56Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.6.3.7 Flight Into Terrain AlertFlight Into Terrain (FIT) alerts occur when the aircraft is too low with respect to terrain based on landing gear status, flap position, and groundspeed. FIT caution alerts are issued when flight conditions meet the criteria shown below. Height Above Terrain (Feet)Altitude Change Rate (FPM)* Flap position will not trigger alert if Flap Override option is enabled; see discussion below.Figure 11-38 Flight Into Terrain Caution Alert CriteriaTo reduce nuisance FIT alerts on approaches where flap extension is not desired (or is intentionally delayed), the pilot may override FIT alerting based on the flap position, while all other FIT alerting remains in effect. Flap Override AnnunciationFlap Override SelectionFigure 11-39 TAWS-A Page Menu and FIT Flap Override Annunciation190-01007-03-Final.indb 56 7/9/2015 2:07:58 PM
11-57190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.6.3.7.1 Overriding Flaps-based FIT alerting 1. While viewing the TAWS-A Page, touch the MENU key. 2. Touch the Flap Override key to toggle the override state. When the Flaps Override option is enabled, the annunciation “FLAP O/R” is annunciated on the TAWS-A Page. If GPWS alerts are also inhibited (which include FIT), the “FLAP O/R” annunciation is not shown. NOTE: The FLAP O/R (Flap Override) should be activated when an approach without flaps is going to be performed. FIT alerts also occur during takeoff or go-around if the aircraft’s height above ground level (as determined by the radar altimeter) is too close to rising terrain. TAWS-A will issue the aural message “Too Low - Terrain” and visual annunciations when conditions enter the caution alert area. Radio Altitude Loss (Feet)Height Above Terrain (Feet)“TOO LOW, TERRAIN”Figure 11-40 FIT Alerting After Takeoff190-01007-03-Final.indb 57 7/9/2015 2:07:59 PM
11-58Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.6.3.8 Negative Climb Rate After Take-Off Alert (NCR)The Negative Climb Rate (NCR) After Take-Off alert (also referred to as “Altitude Loss After Take-Off”) provides alerts when the system determines the aircraft is losing altitude (closing upon terrain) after takeoff. The aural message “Don’t Sink” is given for NCR alerts, accompanied by an annunciation and a pop-up terrain alert on the display. NCR alerting is only active when departing from an airport and when the following conditions are met: • Height above the terrain is less than 700 feet• Distance from the departure airport is 2 NM or less• Heading change from the departure heading is less than 110ºThe NCR alerting parameters as defined by TSO-C151c are shown below. Altitude Loss (Feet)Height Above Terrain (Feet)“DON’T SINK”or“TOO LOW, TERRAIN”Figure 11-41 Negative Climb Rate (NCR) Altitude Loss190-01007-03-Final.indb 58 7/9/2015 2:07:59 PM
11-59190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexSink Rate (FPM)Height Above Terrain (Feet)“DON’T SINK”or“TOO LOW, TERRAIN”Figure 11-42 Negative Climb Rate (NCR) Sink Rate11.6.3.9 Excessive Below Glideslope/Glidepath Deviation AlertA Glideslope Deviation or Glidepath Deviation (GSD) caution alert is issued when the system detects that the aircraft is significantly below the glidepath for the selected approach. Radio Altitude (Feet)Number of Dots Below Glideslope/Glidepath (4 Dot CDI Example)“GLIDESLOPE”Figure 11-43 Excessive Below Glideslope/Glidepath Deviation Alert Criteria190-01007-03-Final.indb 59 7/9/2015 2:08:00 PM
11-60Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexGSD alerting is only active after departure and the following conditions are met: • An ILS, LPV, LNAV/VNAV, or LNAV+V approach is active and vertical navigation indications are being displayed. • Aircraft is below 1000 feet AGL. • Gear is configured for landing. When a GSD caution alert occurs, the aural and visual annunciation “GLIDESLOPE” is issued. If a GSD caution alert occurs on an LPV, LNAV/VNAV, or LNAV+V approach, the aural and visual annunciation “GLIDESLOPE” is issued. 11.6.3.9.1 Inhibiting Glideslope Deviation (GSD) Alerts NOTE: The Glideslope (G/S) Inhibit function should be activated when flying a localizer backcourse approach to prevents nuisance GSD alerts. GSD alerts are inhibited independent from all other FLTA, PDA, and GPWS alerts. 1. While viewing the TAWS-A Page, touch the MENU key. 2. Touch the G/S Inhibit key to inhibit or enable glideslope or glidepath alerts (choice dependent on current state). NOTE: The G/S Inhibit function will only be active for a single approach and the inhibit function will not remain active for subsequent approaches. When G/S alerts are inhibited, they are only inhibited for a single approach. To inhibit G/S alerts on the next approach, the G/S Inhibit function must be activated again between the first and second approaches. NOTE: Glideslope Deviation alerts will not be available if the G/S INHB function is activated.190-01007-03-Final.indb 60 7/9/2015 2:08:00 PM
11-61190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.6.3.10 Inhibiting GPWS Alerts (EDR, ECR, FIT, and NCR) NOTE: The "Inhibit GPWS" function only affects GPWS alerts (EDR, ECR, NCR, and FIT). Alerting for FLTA, PDA, and GSD is controlled independently from the GPWS alerts listed below. EDR, ECR, FIT, and NCR aural and visual alerts can be manually inhibited as a group. Discretion should be used when inhibiting alerts and the GPWS system should be enabled when appropriate. When these alerts are inhibited, the alert annunciation “GPWS INH” is shown on the TAWS-A Page annunciation window. 1. While viewing the TAWS-A Page, touch the MENU key. 2. Touch the GPWS Inhibit key to inhibit or enable GPWS alerts (choice dependent on current state). GPWS Inhibit AnnunciationGPWS Inhibit SelectionFigure 11-44 GPWS Inhibit Annunciation11.6.4 Altitude Voice Call Out (VCO)TAWS-A provides aural advisory alerts as the aircraft descends, beginning at 500 feet above the terrain, as determined by the radar altimeter (if greater than 5 NM from the nearest airport) or 500 feet above the nearest runway threshold elevation (if less than 5 NM from the nearest airport). Upon descent to this altitude, TAWS-A issues the aural alert message “Five-hundred”. 190-01007-03-Final.indb 61 7/9/2015 2:08:01 PM
11-62Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex11.6.5 TAWS-A System StatusDuring power-up, TAWS-A conducts a self-test of its aural and visual annunciations. The system test can also be manually initiated. An aural alert is issued at test completion. TAWS-A System Testing is disabled when ground speed exceeds 30 knots. 11.6.6 TAWS-A Abnormal OperationsTAWS-A continually monitors several system-critical items such as database validity, flap and landing gear position, radar altimeter input, and GPS status. If the GTN does not contain Terrain, Airport Terrain, and Obstacle databases (or the databases are invalid), the aural message “TAWS System Failure” is generated along with the “TAWS FAIL” alert annunciation. TAWS-A requires a 3-D GPS navigation solution along with specific vertical accuracy minimums. Should the navigation solution become degraded or if the aircraft is out of the database coverage area, the annunciation “TAWS N/A” is generated in the annunciation window and on the TAWS-A page, the aural message “TAWS Not Available” is generated if airborne, some TAWS-A terrain alerts will not be issued, and GPWS alerting (which are not dependent on GPS position) will continue to operate. When the GPS signal is re-established and the aircraft is within the database coverage area, the aural message “TAWS Available” is generated. TAWS-A also requires radar altimeter input. Should the radar altimeter input fail or become degraded, the annunciation “GPWS FAIL” is generated in the annunciation window and on the TAWS-A Page. The aural message “GPWS System Failure” is also generated. The “GPWS FAIL” annunciation will also occur if both GPS altitude and barometric altitude are unavailable. If only the GPWS system has failed, GPWS-based alerts will not be available, while other TAWS-A alerting remains unaffected. Multiple TAWS or GPWS annunciations cannot be displayed at the same time. When multiple annunciations exist, an asterisk will be present next to the annunciation. The display of each annunciation will alternate with each being displayed for approximately five seconds. 190-01007-03-Final.indb 62 7/9/2015 2:08:01 PM
12-1190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12 WEATHERWeather data are displayed by the Weather function when an optional weather source is installed. The Wx Weather pages may be oriented to Track Up, Heading Up, or North Up. When more weather products are installed, a key for each product will be shown. Touch the key for the desired weather product. When a single weather product is installed, touching the Weather key will go directly to the Weather page. Touch To Use FIS-B WeatherTouch To Use SiriusXM WeatherTouch To Use Weather RadarTouch To Use Stormscope WeatherTouch To Use Connext WeatherFigure 12-1 Weather Product SelectionFigure 12-2 Weather Page Functional Diagram NOTE: In data link weather, Temporary Flight Restrictions (TFRs) and Notices to Airmen (NOTAMs) that do not have geographical locations cannot be viewed on the GTN. NOTE: Stormscope and XM Lightning are mutually exclusive. 190-01007-03-Final.indb 1 7/9/2015 2:08:01 PM
12-2Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex WARNING: Do not use data link weather information for maneuvering in, near, or around areas of hazardous weather. Information contained within data link weather products may not accurately depict current weather conditions. NOTE: Do not rely solely upon data link services to provide Temporary Flight Restriction (TFR) information. Always confirm TFR information through official sources such as Flight Service Stations or Air Traffic Control. 12.1 SiriusXM Weather Products (Optional)NEXRADWX ForecastLightningEcho TopsCloud TopsMETARCell MovementAIREP/PIREPCounty WarningsWinds AloftSIGMET/AIRMETFreezing LevelIcingTurbulenceCycloneOrientationLegendOff US CanadaCurrent 12 Hour 24 Hour 36 Hour 48 HourTrack Up Heading Up North UpSurface 3000 ft ... 45,000 ftFigure 12-3 SiriusXM Weather Functional Diagram190-01007-03-Final.indb 2 7/9/2015 2:08:01 PM
12-3190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.1 Displaying SiriusXM WeatherTo display SiriusXM Weather touch the Weather key on the Home page. 1. Touch the Weather key on the Home page and then touch the SiriusXM key. Age Of Selected Weather ProductsNEXRAD WeatherWeather Product LegendsTouch + or - To Select AltitudeSelected AltitudeOut Of Coverage AreaFigure 12-4 SiriusXM Weather Page 2. While viewing the Data Link weather page, touch the Menu key to configure the Data Link Weather page. Touch Legend Key To Display LegendTouch Keys To Select Weather Product. Green Bar Indicates Selected Product. Touch NEXRAD Key To Select Off, US, or Canada NEXRADWeather Overlay Map OrientationFigure 12-5 SiriusXM Weather Menu 3. Once you selected what items you want to display, touch BACK to return to the Data Link Weather page. 190-01007-03-Final.indb 3 7/9/2015 2:08:02 PM
12-4Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.2 Weather LegendThe Legend key displays a pop-up legend of the currently displayed weather products. 1. While viewing the Data Link Weather menu, touch the Legend key. Legend Of Selected Weather ProductsTouch Legend And Slide Finger Up And Down To Scroll LegendFigure 12-6 Weather Legend Display 2. Touch the Legend area of the display and while maintaining light pressure against the display, drag your finger up or down to scroll through the legend display for the selected weather products, or use the Up/Down keys. 3. Touch the Legend key again to remove the Legend. 190-01007-03-Final.indb 4 7/9/2015 2:08:02 PM
12-5190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexCycloneCell Movement AIREPS PIREPS LightningNEXRADSurface-FrontsCloud TopsEcho TopsCity Forecast SIGMET/AIRMETMETARFreezing LevelsIcing Potential County WarningsWinds Aloft TurbulenceTFRFigure 12-7 Available Weather Legends12.1.3 Weather Map Orientation 1. While viewing the Weather Data Link function, touch the Menu key. 2. Touch the Orientation key to toggle the map view orientation choices of North Up, Track Up, and Heading Up. 190-01007-03-Final.indb 5 7/9/2015 2:08:03 PM
12-6Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.4 SiriusXM Weather Symbols and Product AgeWhen a weather product is active on the Map function or the Weather Data Link function is selected, the age of the data is displayed on the screen. The age of the data may not indicate the time between the current GPS time and the time when the data is assembled, but rather a general indication of the time elapsed from when the data is received by the GTN. Updated weather data may or may not contain new weather data. Weather data is refreshed at intervals that are defined and controlled by SiriusXM Satellite Radio and its data vendors. If for any reason, a weather product is not refreshed within the designated intervals, the data is considered expired and is removed from the display. This ensures that the displayed data is consistent with what is currently being broadcast by SiriusXM Satellite Radio services. If more than half of the designated time has elapsed from the time the data is received, the color of the product age displayed changes to yellow. WARNING: Do not use the indicated data link weather product age to determine the age of the weather information shown by the data link weather product. Due to time delays inherent in gathering and processing weather data for data link transmission, the weather information shown by the data link weather product may be significantly older than the indicated weather product age. The following table contains the expiration time and XM broadcast interval. The expiration time is an elapsed time after which the data is considered expired and is removed from the display. This ensures that the displayed data is consistent with what is currently being broadcast by SiriusXM Satellite Radio services. If more than half of the expiration time has elapsed from the time the data is received, the color of the product age displayed changes to yellow. The SiriusXM Weather broadcast interval is the time interval when SiriusXM Satellite Radio broadcasts new signals that may or may not contain new weather data. Weather data is broadcast at intervals that are defined and controlled by SiriusXM Satellite Radio. NOTE: SiriusXM Weather does not provide a timestamp for AIRMETs, SIGMETs, City Forecasts, County Warnings, Cell Movement and TFR products. Therefore, the unit does not display a product age indication for these products. 190-01007-03-Final.indb 6 7/9/2015 2:08:03 PM
12-7190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex NOTE: The unit displays valid times on the weather map in lieu of product age indications for SiriusXM Weather Icing Potential, Winds Aloft, and Turbulence weather products. NOTE: The unit displays product age for SiriusXM Weather Freezing Level and Canada Winds Aloft weather products. The product age indication represents the number of minutes that have elapsed since the weather product was created by SiriusXM Weather. The unit does not display the valid times assigned to the information within these products. Weather Product Expiration Time (Minutes)Broadcast Rate (Minutes)NEXRAD (NEXRAD and Echo Top are Mutually Exclusive)30 5 (U.S.) 10 (Canada)Echo Top (Cloud Top and Echo Top Mutually Exclusive) (NEXRAD and Echo Top Mutually Exclusive)30 7.5Cloud Top (Cloud Top and Echo Top Mutually Exclusive)60 15SiriusXM Lightning 30 5Cell Movement 30 1.25SIGMETs / AIRMETs 60 12METARs 90 12WX Forecast 60 12Freezing Levels 120 12Winds Aloft 90 12City Forecast 90 12County Warnings 60 5Cyclone Warnings 60 12Icing Potential (Icing)(SLD)90 22Pilot Weather Report (PIREP)(Blue - Regular, Yellow - Urgent)90 12190-01007-03-Final.indb 7 7/9/2015 2:08:03 PM
12-8Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexWeather Product Expiration Time (Minutes)Broadcast Rate (Minutes)Air Report (AIREP) 90 12Turbulence 180 12Radar Coverage 30 5Temporary Flight Restriction (TFR) 60 12Terminal Aerodrome Forecast (TAF) 60 12Table 12-1 SiriusXM Weather Products and Data TimingSymbol DescriptionFloodSevere ThunderstormTornadoSunnyPart SunCloudyRainyT-StormSnowWindyFoggyHazeHigh/Low TempTable 12-2 Weather Symbols190-01007-03-Final.indb 8 7/9/2015 2:08:03 PM
12-9190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.5 NEXRADWSR-88D, or NEXRAD (NEXt-generation RADar), is a network of 158 high-resolution Doppler radar systems that are operated by the National Weather Service (NWS). NEXRAD data provides centralized meteorological information for the continental United States and selected overseas locations. The maximum range of a single NEXRAD radar site is 250 NM. The NEXRAD network provides important information about severe weather for air traffic safety. NEXRAD data is not real-time. The lapsed time between collection, processing, and dissemination of NEXRAD images can be significant and may not reflect the current radar synopsis. Due to the inherent delays and the relative age of the data, it should be used for long-range planning purposes only. Never use NEXRAD data for maneuvering in, near, or around areas of hazardous weather. Instead, use it in an early-warning capacity of pre-departure and en route evaluation. Composite data from all the NEXRAD radar sites in the United States is shown. This data is composed of the maximum reflectivity from the individual radar sweeps. The display of the information is color-coded to indicate the weather severity level. NOTE: Due to similarities in color schemes, the display of Echo Tops cannot be shown with Cloud Tops and NEXRAD. 1. While viewing the SiriusXM Weather menu, touch the NEXRAD key to display the NEXRAD selections. Figure 12-8 SiriusXM NEXRAD Weather Selection190-01007-03-Final.indb 9 7/9/2015 2:08:03 PM
12-10Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex 2. Touch the desired NEXRAD source selection and then the Back key to view the weather information. Present PositionNEXRAD WeatherAge Of Selected Weather ProductsNEXRAD SourceFigure 12-9 SiriusXM NEXRAD WeatherFigure 12-10 NEXRAD Weather Legend12.1.5.1 ReflectivityReflectivity is the amount of transmitted power returned to the radar receiver. Colors on the NEXRAD display directly correlate to the level of detected reflectivity. Reflectivity as it relates to hazardous weather can be very complex. The role of radar is essentially to detect moisture in the atmosphere. Simply put, certain types of weather reflect radar better than others. The intensity of a 190-01007-03-Final.indb 10 7/9/2015 2:08:04 PM
12-11190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexradar reflection is not necessarily an indication of the weather hazard level. For instance, wet hail returns a strong radar reflection, while dry hail does not. Both wet and dry hail can be extremely hazardous. The different NEXRAD echo intensities are measured in decibels (dB) relative to reflectivity (Z). NEXRAD measures the radar reflectivity ratio, or the energy reflected back to the radar receiver (designated by the letter Z). The value of Z increases as the returned signal strength increases. 12.1.5.2 NEXRAD LimitationsNEXRAD radar images may have certain limitations: • NEXRAD base reflectivity does not provide sufficient information to determine cloud layers or precipitation characteristics. For example, it is not possible to distinguish between wet snow, wet hail, and rain. • NEXRAD base reflectivity is sampled at the minimum antenna elevation angle. An individual NEXRAD site cannot depict high altitude storms at close ranges. It has no information about storms directly over the site. • In the Cell Movement function, “Base” height is actually the height of maximum radar reflection and that the “Base” and “Top” heights are based on radar height and not MSL or AGL. • Each square block on the display represents an area of four square kilometers (2.15 NM). The intensity level reflected by each square represents the highest level of NEXRAD data sampled within the area. Block Area Is 4 km2 (2.15 NM2)Block Area Is 4 km2 (2.15 NM2)Figure 12-11 NEXRAD Data Blocks190-01007-03-Final.indb 11 7/9/2015 2:08:04 PM
12-12Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexThe following may cause abnormalities in displayed NEXRAD radar images:• Ground clutter• Strobes and spurious radar data• Sun strobes (when the radar antenna points directly at the sun)• Interference from buildings or mountains, which may cause shadows• Metallic dust from military aircraft, which can cause alterations in radar scansNEXRAD Limitations (Canada)• Radar coverage extends to 55ºN. • Any precipitation displayed between 52ºN and 55ºN is displayed as mixed because it is unknown. Precipitation Above 52°NOut Of Coverage AreaFigure 12-12 NEXRAD Data - Canada12.1.5.3 Animating NEXRAD NOTE: Animated NEXRAD functionality is available in software version 6.00 and later. When US or Canada NEXRAD is enabled for display and more than two NEXRAD images have been received by the GTN, the NEXRAD display can be animated on the SiriusXM Weather page. As new NEXRAD images are received, the GTN will automatically store them for future animation. The GTN can animate up to six NEXRAD images from oldest to newest, showing each for one second and the newest for two seconds. 190-01007-03-Final.indb 12 7/9/2015 2:08:04 PM
12-13190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexProduct AgeTouch To Start NEXRAD AnimationFigure 12-13 Start NEXRAD Animation 1. While viewing the SiriusXM Weather page with NEXRAD enabled for display, touch the NXRD key to start the NEXRAD animation. NOTE: Weather Forecast, Cloud Tops, and Cell Movement will automatically be turned off while NEXRAD is animating. 2. Touch the NXRD key to stop the NEXRAD animation. The animation will also stop when leaving the page or turning off NEXRAD on the SiriusXM weather page. Touch To Stop NEXRAD AnimationFigure 12-14 Start NEXRAD Animation190-01007-03-Final.indb 13 7/9/2015 2:08:04 PM
12-14Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.6 Echo TopsEcho Tops data shows the location, elevation, and direction of the highest radar echo. The highest radar echo does not indicate the top of a storm or clouds; rather it indicates the highest altitude at which precipitation is detected. This information is determined from NEXRAD data. NOTE: Due to similarities in color schemes, the display of Echo Tops cannot be shown with Cloud Tops and NEXRAD. 1. While viewing the Data Link Weather menu, touch the Echo Tops key. Present PositionEcho TopsProduct AgeFigure 12-15 Echo Tops 2. Touch the Echo Tops key again to turn it off. Figure 12-16 Echo Tops Legend190-01007-03-Final.indb 14 7/9/2015 2:08:04 PM
12-15190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.7 Cloud Tops NOTE: Due to similarities in color schemes, it is not possible to display Echo Tops and Cloud Tops at the same time. Cloud tops data depicts cloud top altitudes as determined from satellite imagery. 1. While viewing the Data Link Weather menu, touch the Cloud Tops key. Present PositionCloud TopsProduct AgeFigure 12-17 Cloud Tops 2. Touch the Cloud Tops key again to turn it off. Figure 12-18 Cloud Tops Legend190-01007-03-Final.indb 15 7/9/2015 2:08:05 PM
12-16Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.8 Cell MovementCell Movement data shows the location and movement of storm cells as identified by a ground-based system. Cells are represented by yellow squares, with direction of movement indicated with short, orange arrows. NOTE: In the Cell Movement function, “Base” height is actually the height of maximum radar reflection and that the “Base” and “Top” heights are based on radar height and not MSL or AGL. 1. While viewing the Data Link Weather menu, touch the Cell Movement key. Cell Movement(Position And Direction Of Movement)Present PositionProduct AgeFigure 12-19 Cell Movement 2. Touch a Cell Movement icon to view cell details. Cell Speed and DirectionBase Height Reported as Altitude of Maximum ReflectivityTop Height Reported as Maximum Altitude of Reflected Precip.Figure 12-20 Cell Movement Detail 3. In the Menu, Touch the Cell Movement key again to turn it off. Figure 12-21 Cell Movement Legend190-01007-03-Final.indb 16 7/9/2015 2:08:05 PM
12-17190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.9 SIGMETs and AIRMETsSIGMETs (SIGnificant METerological Information) and AIRMETs (AIRmen's METerological Information) are broadcast for potentially hazardous weather considered of importance to aircraft. 1. While viewing the Data Link Weather menu, touch the SIGMET/AIRMET key. SIGMET LinePresent PositionTurbulence LineIFR LineFigure 12-22 SIGMETs and AIRMETs 2. Touch the SIGMET/AIRMET key again to turn it off. Figure 12-23 SIGMET/AIRMET Legend190-01007-03-Final.indb 17 7/9/2015 2:08:05 PM
12-18Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.10 County WarningsCounty Warnings data provides specific public awareness and protection weather warnings from the National Weather Service. This can include information on fires, tornadoes, severe thunderstorms, flood conditions, and other natural disasters. 1. While viewing the Data Link Weather menu, touch the County Warnings key. Touch the County Warnings symbol for detailed information. County Warning Symbol - Touch To Display DetailCounty Warning DetailFigure 12-24 County Warnings Data 2. Touch the County Warnings key again to turn it off. Figure 12-25 County Warnings Legend190-01007-03-Final.indb 18 7/9/2015 2:08:05 PM
12-19190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.11 Freezing LevelFreezing Level data shows the color-coded contour lines for the altitude and location at which the Freezing Level is found. When no data is displayed for a given altitude, the data for that altitude has not been received, or is out of date and has been removed from the display. New data appears on the next update. 1. While viewing the Data Link Weather menu, touch the Freezing Level key. Freezing Level LinePresent PositionProduct AgeFreezing Level LineFigure 12-26 Freezing Level 2. Touch the Freezing Level key again to turn it off. Figure 12-27 Freezing Level Legend190-01007-03-Final.indb 19 7/9/2015 2:08:06 PM
12-20Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.12 METARsMETAR (METeorological Aerodrome Report), known as an Aviation Routine Weather Report, is the standard format for current weather observations. METARs are updated hourly and are considered current. METARs typically contain information about the temperature, dew point, wind, precipitation, cloud cover, cloud heights, visibility, and barometric pressure. They can also contain information on precipitation amounts, lightning, and other critical data. METARs are shown as colored flags at airports that provide them. 1. While viewing the Data Link Weather menu, touch the METAR key. Touch an airport symbol for more METAR detail. Touch Airport For METAR DetailProduct AgeMETAR FlagsMETAR DetailFigure 12-28 METARs 2. Touch the METAR key in the Menu again to turn it off. METAR Symbol DescriptionVFR (ceiling greater than 3000 ft. AGL and visibility greater than five miles)Marginal VFR (ceiling 1000–3000 ft. AGL and/or visibility three to five miles)IFR (ceiling 500 to below 1000 ft. AGL and/or visibility one mile to less than three miles)Low IFR (ceiling below 500 ft. AGL or visibility less than one mile)UnknownTable 12-3 METAR Symbols190-01007-03-Final.indb 20 7/9/2015 2:08:06 PM
12-21190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.13 CycloneThe current location of the cyclone is shown along with its projected path with the date and time. 1. While viewing the Data Link Weather menu, touch the Cyclone key. Projected Path With Date And TimeCurrent Position Of CycloneFigure 12-29 Cyclone 2. Touch the Cyclone key again to turn it off. Figure 12-30 Cyclone Legend190-01007-03-Final.indb 21 7/9/2015 2:08:06 PM
12-22Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.14 LightningLightning data shows the approximate location of cloud-to-ground lightning strikes. A yellow cross icon represents a strike that has occurred within a 2 kilometer (approx. 1 NM) region. The exact location of the lightning is not displayed. 1. While viewing the Data Link Weather menu, touch the Lightning key. Present PositionProduct AgeLightning StrikesFigure 12-31 Lightning 2. Touch the Lightning key again to turn it off. Figure 12-32 Lightning Legend190-01007-03-Final.indb 22 7/9/2015 2:08:07 PM
12-23190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.15 Weather ForecastThe Weather Forecast data provides Surface Analysis and City Forecast information for current and forecast weather conditions. The Surface Analysis forecast shows frontal lines indicating weather fronts and the direction they are moving. High and Low pressure centers are noted with a large H or L. A Cold Front is a front where cold air replaces warm air. A blue line with blue triangles will point in the direction of cold air flow. A Warm Front is where warm air replaces cold air. A red line with red half moons will point in the direction of the warm air flow. 1. While viewing the Data Link Weather menu, touch the WX Forecast key. Touch a Wx Forecast symbol for more detail. Weather FrontSurface AnalysisWx Forecast DetailWx Forecast SymbolFigure 12-33 Surface 2. Touch the desired time increment for the forecast period. Figure 12-34 Select Surface Forecast Time Period190-01007-03-Final.indb 23 7/9/2015 2:08:07 PM
12-24Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex City Forecast Fronts Figure 12-35 Surface Legends190-01007-03-Final.indb 24 7/9/2015 2:08:07 PM
12-25190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.16 Winds AloftWinds Aloft data shows the forecast wind speed and direction at the surface and at selected altitudes. Altitudes can be selected in 3000 foot increments from the surface up to 45,000 feet. 1. While viewing the Data Link Weather menu, touch the Winds Aloft key. Wind SymbolsSelected Wind AltitudeTouch To Select Wind AltitudeFigure 12-36 Winds Aloft 2. Touch the WX Aloft ALT – or + keys to increase or decrease the reporting altitude of the winds aloft in 3,000 foot increments. The selected altitude is shown in a window above the altitude keys. 3. Touch the Winds Aloft key again to turn it off. Figure 12-37 Winds Aloft Legend190-01007-03-Final.indb 25 7/9/2015 2:08:07 PM
12-26Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.17 IcingThe Icing product shows a graphic view of the current icing environment in four categories: light, moderate, severe, and extreme (not specific to aircraft type). The Icing product is not a forecast, but a presentation of the current conditions at the time of the analysis. Supercooled Large Droplet (SLD) icing conditions are characterized by the presence of relatively large, super cooled water droplets indicative of freezing drizzle and freezing rain aloft. SLD threat areas are depicted as black and red blocks over the Icing colors. Icing and SLD data are shown between 1,000 feet and 30,000 feet in 3,000 foot increments. 1. While viewing the Data Link Weather menu, touch the Icing key. Icing Potential ShadingSelected Icing AltitudeSLD ThreatTouch To Select Icing AltitudePresent PositionFigure 12-38 Icing and SLD 2. Touch the WX Aloft ALT – or + keys to increase or decrease the reporting altitude of icing in 3,000 foot increments. The selected altitude is shown in a window above the altitude keys. 3. Touch the Icing key again to turn it off. Figure 12-39 Icing Legend190-01007-03-Final.indb 26 7/9/2015 2:08:07 PM
12-27190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.18 TurbulenceTurbulence data identifies the potential for erratic movement of high-altitude air mass associated winds. Turbulence is classified as light, moderate, severe or extreme, at altitudes between 21,000 and 45,000 feet. Turbulence data is intended to supplement AIRMETs and SIGMETs. 1. While viewing the Weather Data Link menu, touch the Turbulence key. Turbulence ShadingSelected Turbulence AltitudeFigure 12-40 Turbulence 2. Touch the WX Aloft ALT – or + keys to increase or decrease the reporting altitude for turbulence in 3,000 foot increments. The selected altitude is shown in a window above the altitude keys. 3. Touch the Turbulence key again to turn it off. Figure 12-41 Turbulence Legend190-01007-03-Final.indb 27 7/9/2015 2:08:08 PM
12-28Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.1.19 AIREP/PIREPPilot Weather Reports (PIREPs) provide timely weather information for a particular route of flight. When significant weather conditions are reported or forecast, Air Traffic Control (ATC) facilities are required to solicit PIREPs. A PIREP may contain non-forecast adverse weather conditions, such as low in-flight visibility, icing conditions, wind shear, and turbulence. PIREPs are issued as either Routine (UA) or Urgent (UUA). 1. While viewing the Data Link Weather menu, touch the AIREP/PREP key. Routine PIREP Symbol (Blue). Touch For Details.Urgent PIREP Symbol (Yellow). Touch For Details.AIREP Symbol (Green). Touch For Details. Figure 12-42 Weather Display With AIREP/PIREP Information Active 2. Touch a weather information symbol to view details for that item. AIREP DetailsTouch An AIREP/PIREP Symbol For DetailFigure 12-43 AIREP/PIREP Information Detail190-01007-03-Final.indb 28 7/9/2015 2:08:08 PM
12-29190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex 3. Touch the Back key to remove the detailed information. 4. Touch the AIREP/PREP key again to turn it off. 12.2 StormScope® Weather12.2.1 StormScope® (Optional) NOTE: Refer to the WX-500 Pilot’s Guide for a detailed description of the WX-500 StormScope. The WX-500 StormScope Weather Mapping Sensor is a passive weather avoidance system that detects electrical discharges associated with thunderstorms within a 200 NM radius of the aircraft. The StormScope measures relative bearing and distance of thunderstorm-related electrical activity and reports the information to the display. Interfaces are currently only available for the WX-500 StormScope System. For lightning display interpretation, study the examples in the WX-500 Pilot's Guide that are designed to help you relate the cell or strike patterns shown on the display to the size and location of thunderstorms that may be near your aircraft. Symbol Time Since Strike (Seconds)660120180Table 12-4 Stormscope Symbols 1. From the Home page, touch the Weather key (and then the StormScope key if present) to reach the StormScope function. 190-01007-03-Final.indb 29 7/9/2015 2:08:08 PM
12-30Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexRange RingLightning StrikesLightning Strike RateLightning Display Mode(Cell or Strike)Touch To Clear Lightning StrikesOrientation Annunciation. HDG N/A - Heading Is Not Available. Figure 12-44 StormScope Display (360º Display View Shown) 2. Touch the Menu key to setup the StormScope display. Arc View SelectedLightning Display Mode- Strike SelectedFigure 12-45 StormScope Menu3. Touch the 360° or Arc to select the display view. ViewMode360 ArcCell StrikeFigure 12-46 StormScope Functional Diagram190-01007-03-Final.indb 30 7/9/2015 2:08:08 PM
12-31190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.2.2 Clearing the StormScope® PageRoutinely clearing the StormScope Page of all discharge points is a good way to determine if a storm is building or dissipating. In a building storm discharge points reappear faster and in larger numbers. In a dissipating storm discharge points appear slower and in smaller numbers. 1. While viewing the Weather StormScope page, touch the Clear Strikes key to clear lightning strikes. 2. Lightning strikes will be cleared from the display and the Rate value will be reset. NOTE: When Heading is not available (N/A), the pilot must clear the strikes after each turn. 12.2.3 Changing the StormScope® Display ViewThe Lightning Page displays either a 360° or a 120° viewing angle. 1. While viewing the Weather StormScope page, touch MENU. 2. Touch the 360° or Arc to select the display view. Figure 12-47 StormScope 360º and Arc Display Views12.2.4 Changing the Storm Data Display RangeStorm data can be displayed on the Map page 2000 NM zoom scale, but the data only goes out as far as the StormScope can report (200 NM). The 190-01007-03-Final.indb 31 7/9/2015 2:08:09 PM
12-32Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex500 NM zoom scale will display all lightning data. Scales greater than 500 NM do not display any additional StormScope data. While viewing the StormScope page touch the In and Out keys to display a larger or smaller area. NOTE: Cell mode uses a clustering program to identify clusters of electrical activity that indicate cells. Cell mode is most useful during periods of heavy storm activity. Displaying cell data during these periods frees the user from sifting through a screen full of discharge points and helps to better determine where the storm cells are located. 12.2.5 Displaying StormScope® Data on the Map PageThe Map Page displays cell or strike information using yellow lightning strike symbology overlaid on a moving map. This added capability improves situational awareness, which in turn makes it much easier for the pilot to relate storm activity to airports, NAVAIDs, obstacles and other ground references. 1. On the Home page, touch the Map key. 2. Touch the Menu key. 3. Touch the StormScope key to enable StormScope lightning display on the Map page. Repeated touches toggle between Off, Cell, and Strike. NOTE: The selected lightning display type, cell or strike, will be shown the same on both the StormScope and the Map pages. NOTE: StormScope data is displayed on the Map Page only if aircraft heading is available. NOTE: The GTN will display StormScope data with or without a heading source. If no heading source is available, the display will indicate this by placing “HDG N/A” in the upper right portion of the display. If no heading is available, the pilot must clear the strikes after each heading change. 190-01007-03-Final.indb 32 7/9/2015 2:08:09 PM
12-33190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.3 Weather RadarThe GTN 7XX can display weather radar from a Garmin GWX system or from selected 3rd party radars. Only one weather radar system may be interfaced to the system. For detailed information on the operation of 3rd party radars, refer to their specific documentation. 12.3.1 Garmin GWX Radar DescriptionThe Garmin GWX 68 and GWX 70 Airborne Color Weather Radars combine excellent range and adjustable scanning profiles with a high-definition target display. To focus radar scanning on specific areas, Sector Scanning offers pilot-adjustable horizontal scan angles of 20º, 40º, 60º, or 90º (up to 120º with the GWX 70). A vertical scanning function helps to analyze storm tops, gradients, and cell buildup activity at various altitudes. See the documentation of each radar for specific features. 12.3.1.1 Principles of Pulsed Airborne Weather RadarThe term RADAR is an acronym for RAdio Detecting and Ranging. Pulsed radar locates targets by transmitting a microwave pulse beam that, upon encountering a target, is then reflected back to the radar receiver as a return “echo.” The microwave pulses are focused and radiated by the antenna, with the most intense energy in the center of the beam and decreasing intensity near the edge. The same antenna is used for both transmitting and receiving. The returned signal is then processed and displayed on the GTN 7XX. Radar detection is a two-way process that requires 12.36 micro-seconds for the transmitted microwave pulses to travel out and back for each nautical mile of target range. It takes 123.6 micro-seconds for a transmitted pulse to make the round trip if a target is 10 NM away. The GWX weather radar should be used to avoid severe weather, not for penetrating severe weather. The decision to fly into an area of radar targets depends on target intensity, spacing between the targets, aircraft capabilities and pilot experience. Pulse type weather radar detects only precipitation, not clouds or turbulence. The display may indicate clear areas between intense returns, but this does not necessarily mean it is safe to fly between them. Only Doppler radar can detect turbulence. 190-01007-03-Final.indb 33 7/9/2015 2:08:09 PM
12-34Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexAirborne weather radar has other capabilities beyond weather detection. It also has the ability to detect and provide distance to objects on the ground, such as, cities, mountains, coastlines, rivers, lakes, and oceans. 12.3.1.2 Antenna Beam IlluminationIt is important to understand the concept of the antenna beam illumination. The radar beam is much like the beam of a spotlight. The farther the beam travels, the wider it gets. The radar is only capable of “seeing” what is inside the boundaries of the beam. Figure 12-48 Radar Beam from 12 inch AntennaThe vertical dimensions of the radar beam are shown in the figure above and the same holds true for the horizontal dimensions. In other words, the beam will be as wide as it is tall. Note that it is possible not to see areas of precipitation on the radar display because of the antenna tilt setting. With the antenna tilt set to zero in this illustration, the beam overshoots the precipitation at 15 NM. The curvature of the earth can also be a factor, especially at range settings of 150 NM or more. NMFigure 12-49 Radar Beam in Relation to the Curvature of the Earth190-01007-03-Final.indb 34 7/9/2015 2:08:10 PM
12-35190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.3.1.3 Radar Signal AttenuationThe phenomena of weather attenuation needs to be kept in mind whenever operating the weather radar. When the radar signal is transmitted, it is progressively absorbed and scattered, making the signal weaker. This weakening, or attenuation, is caused by two primary sources, distance and precipitation. Attenuation because of distance is due to the fact that the amount of radar energy at a distance from the antenna is inversely proportional to the square of the distance. The reflected radar energy from a target 40 miles away that fills the radar beam will be one fourth the energy reflected from an equivalent target 20 miles away. This would appear to the operator that the storm is gaining intensity as the aircraft gets closer. Internal circuitry within the GWX system compensates for much of this distance attenuation. Attenuation due to precipitation is not as predictable as distance attenuation. It is also more intense. As the radar signal passes through moisture, a portion of the radar energy is reflected back to the antenna. However, much of the energy is absorbed. If precipitation is very heavy, or covers a large area, the signal may not reach completely through the area of precipitation. The weather radar system cannot distinguish between an attenuated signal and area of no precipitation. If the signal has been fully attenuated, the radar will display a “radar shadow.” This appears as an end to the precipitation when, in fact, the heavy rain may extend much further. A cell containing heavy precipitation may block another cell located behind the first, preventing it from being displayed on the radar. Never fly into these shadowed areas and never assume that all of the heavy precipitation is being displayed unless another cell or a ground target can be seen beyond the heavy cell. The WATCH™ feature of the GWX Weather Radar system can help in identifying these shadowed areas. Areas in question will appear as “shadowed” or gray area on the radar display. Proper use of the antenna tilt control can also help detect radar shadows. Attenuation can also be due to poor maintenance or degradation of the radome. Even the smallest amount of wear and tear, pitting, and pinholes on the radome surface can cause damage and system inefficiency. 190-01007-03-Final.indb 35 7/9/2015 2:08:10 PM
12-36Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.3.2 Radar Signal Reflectivity12.3.2.1 PrecipitationPrecipitation or objects more dense than water, such as earth or solid structures, will be detected by the weather radar. The weather radar will not detect clouds, thunderstorms or turbulence directly. It detects precipitation associated with clouds, thunderstorms, and turbulence. The best radar signal reflectors are raindrops, wet snow or wet hail. The larger the raindrop the better it reflects. The size of the precipitation droplet is the most important factor in radar reflectivity. Because large drops in a small concentrated area are characteristic of a severe thunderstorm, the radar displays the storm as a strong return. Ice, dry snow, and dry hail have low reflective levels and often will not be displayed by the radar. A cloud that contains only small raindrops, such as fog or drizzle, will not reflect enough radar energy to produce a measurable target return. Figure 12-50 Precipitation Type and Reflectivity190-01007-03-Final.indb 36 7/9/2015 2:08:10 PM
12-37190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.3.2.2 Ground ReturnsThe intensity of ground target returns depends upon the angle at which the radar beam strikes the ground target (Angle of Incidence) and the reflective properties of that target. The gain can be adjusted so shorelines, rivers, lakes, and cities are well defined. Increasing gain too much causes the display to fill in between targets, thus obscuring some landmarks. Cities normally provide a strong return signal. While large buildings and structures provide good returns, small buildings can be shadowed from the radar beam by the taller buildings. As the aircraft approaches, and shorter ranges are selected, details become more noticeable as the highly reflective regular lines and edges of the city become more defined. Bodies of water such as lakes, rivers, and oceans are not good reflectors, and normally do not provide good returns. The energy is reflected in a forward scatter angle with inadequate energy being returned. They can appear as dark areas on the display. However, rough or choppy water is a better reflector and will provide stronger returns from the downwind sides of the waves. Mountains also provide strong return signals to the antenna, but also block the areas behind. However, over mountainous terrain, the radar beam can be reflected back and forth in the mountain passes or off canyon walls using up all or most of the radar energy. In this case, no return signal is received from this area causing the display to show a dark spot which could indicate a pass where no pass exists. 12.3.2.3 Angle of IncidenceThe angle at which the radar beam strikes the target is called the Angle of Incidence. Incident angle (“A”) is illustrated below. This directly affects the detectable range, the area of illumination, and the intensity of the displayed target returns. A large incident angle gives the radar system a smaller detectable range and lower display intensity due to minimized reflection of the radar energy. 190-01007-03-Final.indb 37 7/9/2015 2:08:10 PM
12-38Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexFigure 12-51 Angle of IncidenceA smaller incident angle gives the radar a larger detectable range of operation and the target display will show a higher intensity. Since more radar energy is reflected back to the antenna with a low incident angle, the resulting detectable range is increased for mountainous terrain. 12.3.3 Operating DistanceThe following information establishes a minimum safe distance from the antenna for personnel near an operating airborne weather radar. The minimum safe distance is based upon the FCC’s exposure limit at 9.3 to 9.5 GHz for general population/uncontrolled environments which is 1 mW/cm2. See Advisory Circular 20-68B for more information on safe distance determination. 12.3.3.1 Maximum Permissible Exposure Level (MPEL) (GWX 68)The zone in which the radiation level exceeds the US Government standard of 1 mW/cm2, is the semicircular area of at least 11 feet from the 12 inch antenna as indicated in the illustration below. All personnel must remain outside of this zone. With a scanning or rotating beam, the averaged power density at the MPEL boundary is significantly reduced. 12.3.3.2 Maximum Permissible Exposure Level (MPEL) (Other Radars)See the appropriate documentation for MPEL. 190-01007-03-Final.indb 38 7/9/2015 2:08:11 PM
12-39190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexMPELBoundary11’ for 12” antennaFigure 12-52 MPEL Boundary12.3.4 Basic Antenna Tilt SetupThe following discussion is a simple method for setting up the weather radar antenna tilt for most situations. It is not to be considered an all encompassing setup that will work in all situations, but this method does provide good overall parameters for the monitoring of threats. Ultimately, it is desired to have the antenna tilted so that the bottom of the radar beam is four degrees below parallel with the ground. The following discussion explains one way of achieving this. With the aircraft flying level, adjust the antenna tilt so ground returns are displayed at a distance that equals the aircraft’s current altitude (AGL) divided by 1,000. For example, if the aircraft is at 14,000 feet, adjust the tilt so the front edge of ground returns are displayed at 14 NM. Note this antenna tilt angle setting. Now, raise the antenna tilt 6º above this setting. The bottom of the radar beam is now angled down 4º from parallel with the ground. Practical Application Using the Basic Tilt SetupAt this point, when flying at altitudes between 2,000 and 30,000 feet AGL, any displayed target return should scrutinized. If the displayed target advances on the screen to 5 NM of the aircraft, avoid it. This may be either weather or ground returns that are 2,000 feet or less below the aircraft. Raising the antenna tilt 4º can help separate ground returns from weather returns in relatively flat terrain. This will place the bottom of the radar beam level with the ground. Return the antenna tilt to the previous setting after a few sweeps. 190-01007-03-Final.indb 39 7/9/2015 2:08:11 PM
12-40Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexIf the aircraft is above 29,000 feet, be cautious of any target return that gets to 30 NM or closer. This is likely a thunderstorm that has a top high enough that the aircraft cannot fly over it safely. If the aircraft altitude is 15,000 feet or lower, set the displayed range to 60 NM. Closely monitor anything that enters the display. Also, after setting up the antenna tilt angle as described previously, ground returns can be monitored for possible threats. The relationship between antenna tilt angle, altitude, and distance is one degree of tilt equals 100 feet of altitude for every one nautical mile. Vertical Change of Radar Beam (feet)Change in Antenna Tilt10 nm010002000300040001000200030004000-1°0°-2°-3°-4°+1°+2°+3°+4°Figure 12-53 Vertical Change in Radar Beam per Nautical MileTherefore, with the antenna tilt set so that the bottom of the beam is four degrees below parallel with the ground, a target return at 10 NM is approximately 4,000 feet below the aircraft; at 20 NM, 8,000 feet; at 50 NM, 20,000 feet. In other words, at this tilt setting, a ground return (such as a mountain peak) being displayed at 10 NM would have a maximum distance below the aircraft of 4,000 feet. If that ground target return moves to 5 NM, maximum distance below the aircraft will be 2,000 feet. This setup will provide a good starting point for practical use of the GWX radar. There are many other factors to consider in order to become proficient at using weather radar in all situations. 12.3.5 Weather Mapping and Interpretation12.3.5.1 Weather display InterpretationWhen evaluating various target returns on the weather radar display, the colors denote approximate rainfall intensity and rates as shown in the table below. 190-01007-03-Final.indb 40 7/9/2015 2:08:11 PM
12-41190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndexWeather Mode ColorGWX 68 Radars GWX 70 Radars 3rd Party RadarsApproximate IntensityApproximateRainfall Rate (in/hr)Approximate IntensityRadar Return Level (see radar docu-mentation for details)BLACK < 23 dBZ < .01 < 23 dBZ 0GREEN 23 dBZ to < 33 dBZ .01 - 0.1 23 dBZ to < 33 dBZ 1YELLOW 33 dBZ to < 41 dBZ 0.1 - 0.5 33 dBZ to < 41 dBZ 2RED 41 dBZ to < 50 dBZ 0.5 - 2 > 41 dBZ 3MAGENTA 50 dBZ and greater > 2 Turbulence Detection 4Table 12-5 Precipitation Intensity Levels12.3.5.2 ThunderstormsUpdrafts and downdrafts in thunderstorms carry water through the cloud. The more severe the drafts, the greater the number and size of the precipitation droplets. With this in mind, the following interpretations can be made from what is displayed on the weather radar. Avoid these areas by an extra wide margin. • In areas where the displayed target intensity is red or magenta (indicating large amounts of precipitation), the turbulence is considered severe. • Areas that show steep color gradients (intense color changes) over thin bands or short distances suggest irregular rainfall rate and strong turbulence. • Areas that show red or magenta are associated with hail or turbulence, as well as heavy precipitation. Vertical scanning and antenna tilt management may be necessary to identify areas of maximum intensity. Along squall lines (multiple cells or clusters of cells in a line), individual cells may be in different stages of development. Areas between closely spaced, intense targets may contain developing clouds not having enough moisture to produce a return. However, these areas could have strong updrafts or downdrafts. Targets showing wide areas of green are generally precipitation without severe turbulence. Irregularities in the target return may also indicate turbulence, appearing as “hooks,” “fingers,” or “scalloped” edges. These irregularities may be present in green areas with no yellow, red, or magenta areas and should be treated as highly dangerous areas. Avoid these areas as if they were red or magenta areas. 190-01007-03-Final.indb 41 7/9/2015 2:08:11 PM
12-42Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexSteep GradientSquall LineHook or Finger Scalloped EdgeFigure 12-54 Cell IrregularitiesThunderstorm development is rapid. A course may become blocked within a short time. When displaying shorter ranges, periodically select a longer range to see if problems are developing further out. That can help prevent getting trapped in a “blind alley” or an area that is closed at one end by convective weather. Figure 12-55 The “Blind Alley” Overhead ViewIn areas of multiple heavy cells, use the Vertical Scan feature along with antenna tilt management to examine the areas. Remember to avoid shadowed areas behind targets. Figure 12-56 The “Blind Alley” Vertical Scan190-01007-03-Final.indb 42 7/9/2015 2:08:12 PM
12-43190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.3.5.3 TornadoesThere is no conclusive radar target return characteristics which will identify a tornado, however, tornadoes may be present if the following characteristics are observed: • A narrow, finger-like portion, as shown on the previous page, extends and, in a short time, curls into a hook and closes on itself. • A “hook” which may be in the general shape of the numeral “6,” especially if bright and projecting from the southwest quadrant (northeast quadrant in the southern hemisphere) of a major thunderstorm. • V- shaped notches. • Doughnut shapes. These shapes do not always indicate tornadoes, nor are tornado returns limited to these characteristics. Confirmed radar observations of tornadoes most often have not shown shapes different from those of a normal thunderstorm display. 12.3.5.4 HailHail results from updrafts carrying water high enough to freeze. Therefore, the higher the top of a thunderstorm, the greater the probability that it contains hail. Vertically scanning the target return can give the radar top of a thunderstorm that contains hail. Radar top is the top of a storm cell as detected by radar. It is not the actual top, or true top of the storm. The actual top of a storm cell is seen with the eyes in clear air and may be much higher than the radar top. The actual top does not indicate the top of the hazardous area. Hail can fall below the minimum reflectivity threshold for radar detection. It can have a film of water on its surface, making its reflective characteristics similar to a very large water droplet. Because of this film of water, and because hail stones usually are larger than water droplets, thunderstorms with large amounts of wet hail return stronger signals than those with rain. Some hail shafts are extremely narrow (100 yards or less) and make poor radar targets. In the upper regions of a cell where ice particles are “dry” (no liquid coating), target returns are less intense. Hail shafts are associated with the same radar target return characteristics as tornados. U-shaped cloud edges 3 to 7 miles across can also indicate hail. These target returns appear quite suddenly along any edge of the cell outline. They also change in intensity and shape in a matter of seconds, making vigilant monitoring essential. 190-01007-03-Final.indb 43 7/9/2015 2:08:12 PM
12-44Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.4 GWX Radar Operation in Weather Mode WARNING: Begin transmitting only when it is safe to do so. When transmitting while the aircraft is on the ground, no personnel or objects should be within 11 feet of the antenna. CAUTION: In Standby mode, the antenna is parked at the center line. It is always a good idea to put the radar in Standby mode before taxiing the aircraft to prevent the antenna from bouncing on the bottom stop and possibly causing damage to the radar assembly. When the weather radar system is in the Weather or Ground Map mode, the system automatically switches to Standby mode on landing. TiltShow BearingModeScanSector ScanGainOff Standby Weather Ground TestHorizontal VerticalBearing20 40 60 90 (GWX 70) FullTurbulence Detection (GWX 70)GCS (GWX 70)ACT (GWX 70)Watch ShadingWeather AlertStabilizeFigure 12-57 Weather Radar Functional Diagram190-01007-03-Final.indb 44 7/9/2015 2:08:12 PM
12-45190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.4.1 Viewing Weather on the Weather Radar Page 1. From the Home page, touch the Weather key on the Home page and then touch the Radar key (if necessary). Precipitation ScaleOperating ModeBearing LineScan LineBearing Line AdjustmentGain Calibration SettingSector Scan SelectionScan DirectionTilt AdjustmentRange ScaleAntenna StabilizationOrientationBearing Line DisplayFigure 12-58 Weather Radar Page (Horizontal Scan) 2. Touch the MODE key and then touch the function desired. 3. The color-coded precipitation scale is shown on the left side of the display. A table describing the precipitation intensity levels is in section 12.3.5.1. Precipitation Color ValuesGWX 68 GWX 70Figure 12-59 Weather Radar Precipitation Scale 4. Touch the IN and OUT keys to select the desired range. Touch the desired keys to set any required values as described below. 190-01007-03-Final.indb 45 7/9/2015 2:08:12 PM
12-46Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.4.2 Configuring Weather Radar PageTo configure the WX Radar page, the Radar Mode must be in Ground, Weather, or Test mode. When one of these modes is selected, a warm-up period is initiated (countdown is displayed on the screen). After the warm-up is complete, the selected mode will be available. 1. While on the ground, touch MODE. 2. In the Weather Radar Mode window, touch STANDBY. Touch the Desired ModeFigure 12-60 Weather Radar Mode Selection 3. Touch MODE and select Weather, Ground, or Test. A caution window is displayed. Figure 12-61 Caution for Radar Activation Confirmation 4. Touch OK to acknowledge the selected mode will be activated. If Weather or Ground is selected, a warm-up period is initiated (countdown is displayed on the screen). After the warm-up is complete, the radar begins transmitting. 190-01007-03-Final.indb 46 7/9/2015 2:08:13 PM
12-47190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.4.3 Vertically Scanning a Storm CellWhen vertically scanning with stabilization ON, the actual physical area that the radar is sweeping may not match the vertical scan display. This occurs whenever the aircraft pitch is not at 0 degrees. To compensate for this, the vertical display will “erase” the portion of the vertical display that is no longer being scanned. It will appear that the vertical sweep “wraps around” when reaching the end of the GTN vertical display. The radar is simply “erasing” the portion of the vertical display that is not currently being scanned. NOTE: Vertical scanning of a storm cell should be done with the aircraft wings level to avoid constant adjustment of the Bearing Line. Precipitation ScaleOperating ModeScan LineGain Calibration SettingShow Tilt SelectionScan DirectionTilt AdjustmentRange ScaleAntenna StabilizationTilt LineFigure 12-62 Weather Radar Page (Vertical Scan)190-01007-03-Final.indb 47 7/9/2015 2:08:13 PM
12-48Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.4.4 Adjusting the Antenna Tilt AngleIn order to make an accurate interpretation of a storm cell, the radar beam should be pointed at the wet part of the weather cell to record the proper rainfall intensity (color level). The ideal aiming point is just below the freezing level of the storm. The best way to find this point is to use the Vertical Scan feature. The antenna tilt angle can be centered on the strongest return area in the vertical scan to get a more accurate view of the coverage and intensity of the target in the horizontal scan. 1. While viewing the WX Radar page touch the TILT key. An adjustment window will be displayed. Touch To Adjust Tilt AngleNumeric Adjusted Tilt AngleFigure 12-63 Adjusting Tilt 2. Touch the Up and Down Arrow keys to adjust the Tilt. The range is DN 15° to UP 15°. 3. Touch Back to save the values and return to the Radar display. 190-01007-03-Final.indb 48 7/9/2015 2:08:13 PM
12-49190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.4.5 Adjusting the Bearing Line 1. Touch the SHOW BRG key. This displays the Bearing Line in Horizontal Scanning mode. 2. To adjust the Bearing Line, touch the BEARING key. An adjustment window will be displayed. Touch To Adjust BearingNumeric Adjusted Bearing Value And DirectionFigure 12-64 Bearing Line Adjustment 3. Touch the Gain Adjustment arrow keys to change the gain. 4. Touch Back to save the values and return to the Radar display. 190-01007-03-Final.indb 49 7/9/2015 2:08:13 PM
12-50Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.4.6 Adjusting GainGain is used to adjust the sensitivity of the radar receiver. It can be used to adjust the characteristics of the returns from the surface. WARNING: Changing the gain in weather mode will cause precipitation intensity to be displayed as a color not representative of the true intensity. Remember to return the gain setting to : “Calibrated” for viewing the actual intensity of precipitation. 1. While viewing the WX Radar page touch the GAIN key. The Gain Adjustment Bar will be displayed.Touch to Return to Calibrated GainTouch To Adjust GainRelative Adjusted Gain ValueNumeric Adjusted Gain ValueFigure 12-65 Gain Adjustment 2. Touch the Gain Adjustment arrow keys to change the gain. 3. Touch Back to save the values and return to the Radar display. Restore Calibrated Gain 1. While viewing the WX Radar page touch GAIN to display the Gain adjustment window. 2. Touch the SET TO CALIBRATED key. This will restore the calibrated gain. 190-01007-03-Final.indb 50 7/9/2015 2:08:13 PM
12-51190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.4.7 Sector ScanAdjusting the Sector Scan reduces the scan angle from Full in increments of ±20°, ±40°, and ±60° in horizontal or vertical scanning. 1. While viewing the WX Radar page, touch Sector Scan to display the Sector Scan Mode window. Touch the Desired Sector SizeGWX 68 GWX 70Figure 12-66 Sector Scan Mode 2. Touch the desired mode. After selection, you are returned to the Weather Radar Menu screen. 3. Touch Back again to return to the Weather Radar screen. Scan LineSelected Sector Scan RangeSector Scan Selection KeyFigure 12-67 Selected Sector Scan Range190-01007-03-Final.indb 51 7/9/2015 2:08:14 PM
12-52Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.4.8 Weather Radar Menu Touch Menu to view the Weather Radar Menu. Touch To Enable Antenna StabilizationTouch To Enable Weather AlertsTouch To Enable WATCH ShadingGWX 68GWX 70Touch To Enable Turbulence DetectionTouch To Enable Altitude Compensated TiltTouch To Enable Ground Clutter SuppressionFigure 12-68 Weather Radar Menu Selections NOTE: Ground Clutter Suppression (GCS) and Turbulence Detection is only supported for 12” or larger RADAR antennas. Turbulence Detection is only supported out to a range of 40 NM and is disabled at display ranges greater than 160 NM. 12.4.8.1 Weather Attenuated Color Highlight (WATCH™)While in horizontal scan mode, this feature can be used as a tool to determine areas of possible inaccuracies in displayed intensity due to weakening of the radar energy. This weakening is known as “attenuation.” The radar energy weakens as it passes through areas of intense precipitation, large areas of lesser precipitation, and distance. Issues with the radome will also attenuate the radar energy. All these factors have an effect on the return intensity. The more energy that dissipates, the lesser the displayed intensity of the return. Accuracy of the displayed intensity of returns located in the shaded areas are suspect. Make maneuvering decisions with this information in mind. Proper antenna tilt management should still be employed to determine the extent of attenuation in a shaded area. 1. While viewing the Weather Radar Menu, touch WATCH Shading to toggle WATCH Shading. 190-01007-03-Final.indb 52 7/9/2015 2:08:14 PM
12-53190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex 2. To deactivate Watch Mode, repeat sequence. Watch Shaded AreaFigure 12-69 Horizontal Scan with WATCH12.4.8.2 Weather AlertThe Weather Alert feature may be used to indicate the presence of heavy precipitation beyond the currently displayed range and 80 to 320 NM from the aircraft’s present position. Weather Alert targets appear as red bands along the outer range ring at the approximate azimuth of the detected returns. If a Weather Alert is detected within ±10° of the aircraft heading, a message will be displayed in the Messages page. Touch the MSG key to view messages. Weather AlertsFigure 12-70 Weather Alert DisplayIf the antenna tilt is adjusted too low, a weather alert can be generated by ground returns. To avoid this issue, set the display range to less than 80 NM in the terminal area. Weather alerts can also be deactivated in the terminal area. 190-01007-03-Final.indb 53 7/9/2015 2:08:14 PM
12-54Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex 1. While viewing the Weather Radar Menu, touch Weather Alert to toggle Weather Alerts. 2. To deactivate Weather Alerts, repeat sequence. 12.4.8.3 Antenna Stabilization 1. While viewing the Weather Radar Menu, touch Stabilize to toggle Antenna Stabilization. 2. To deactivate Antenna Stabilization, repeat sequence. The current stabilization condition is shown in the top right of the weather radar display. 12.4.8.4 Altitude Compensated Tilt (ACT) - GWX 70 onlyAltitude Compensated Tilt (ACT) automatically adjusts the tilt to compensate for altitude changes as you climb or descend. 1. While viewing the Weather Radar Menu, touch ACT to toggle ACT. 2. To deactivate ACT, repeat sequence. 12.4.8.5 Turbulence Detection - GWX 70 onlyTurbulence Detection activates a feature that detects and displays severe turbulence. Turbulence Detection is inactive at ranges greater that 160 NM. If Turbulence Detection is enabled and available, Turbulence Detection will be reported as Inactive in any of the following conditions: • Scan orientation is not Horizontal• Scan range is greater than 160 NM• Radar mode is not Weather 1. While viewing the Weather Radar Menu, touch Turbulence Detection to toggle Turbulence Detection. 2. To deactivate Turbulence Detection, repeat sequence. 12.4.8.6 Ground Clutter Suppression (GCS) - GWX 70 onlyGround Clutter Suppression reduces the amount of returns as a result of highly reflective objects on the ground, such as buildings or cities, while maintaining the intensity and size of weather returns. 1. While viewing the Weather Radar Menu, touch GCS to toggle Ground Clutter Suppression. 2. To deactivate Ground Clutter Suppression, repeat sequence. 190-01007-03-Final.indb 54 7/9/2015 2:08:14 PM
12-55190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.5 Connext WeatherConnext Weather is an optional feature available with the Iridium® satellite system that is interfaced through the optional Garmin GSR 56. Connext Weathermay be viewed in the Weather and Map functions. The Weather pages may be oriented to either Track Up, Heading, or North Up. Both Connext and XM Weather may be installed and selected individually. Connext Weather coverage is available throughout most of Europe, Canada and the U.S. Additional radar coverage areas are being added continuously. PRECIPLightningIR SatelliteMETARPIREPWinds AloftSIGMET/AIRMETConnext SettingsOrientationLegendSurface 3000 ft ... 45,000 ftCoverage RegionData RequestPresent PositionDestinationFlight Plan DistanceWaypoint Waypoint IdentRequest DataAuto RequestCov DiameterDatalink StatusFigure 12-71 Connext Weather Functional Diagram190-01007-03-Final.indb 55 7/9/2015 2:08:14 PM
12-56Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndexMore detail on Connext weather products and coverage can be found at: http://fly.garmin.com/fly-garmin/gfds-weather/ NOTE: A system can be configured for multiple weather products, but only one may be selected for viewing in the Weather or map pages at a given time. 1. While viewing the Connext Weather page, press the MENU key to display the Connext Weather Menu. Figure 12-72 Select Connext Weather 2. Touch the desired key to access the settings. The settings will affect the display on both the Weather and Map pages. 190-01007-03-Final.indb 56 7/9/2015 2:08:15 PM
12-57190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.5.1 Using Connext Satellite Weather ProductsWhen a weather product is active on the Weather Data Link Page or the Navigation Map Page, the age of the data is displayed on the screen. The age of the product is based on the time difference between when the data was assembled on the ground and the current GPS time. Weather products are refreshed at selectable intervals. Weather products expire at intervals based on each product. When the data expires, it is removed from the display. This ensures that the displayed data is consistent with what is currently being broadcast by Connext Satellite Radio services. If more than half of the expiration time has elapsed from the time the data is received, the color of the product age displayed changes to yellow. 12.5.2 Connext Weather MenuThe Connext Weather page is customized by selecting options from the Connext Weather and the Connext Settings Menus. The Connext Weather Menu options include choices for Weather Setup and displaying selected weather products. The Connext Settings Menu makes settings for the Coverage Region and Data Request frequency. 1. While viewing the Connext Weather page, touch the MENU key to display the Connext Weather Menu. Touch the desired keys to toggle the weather product. Figure 12-73 Connext Weather Menu 2. Touch the Connext Settings key to make detailed settings for the Connext Weather display. 190-01007-03-Final.indb 57 7/9/2015 2:08:15 PM
12-58Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.5.3 Connext SettingsAuto Request SettingCoverage Region SettingsDatalink StatusTime To Next Data RequestTouch To Manually Request DataFigure 12-74 Connext Settings Menu12.5.3.1 Connext Data RequestIt is necessary to request the downloading of weather products. Requests can be sent manually or set to automatically update at a selected rate. The Connext weather data may be updated at any time regardless of the automatic update timing by selecting a Manual Request. When multiple requests are made, some products are merged with the old data (SIGMETs/AIRMETs, TAFs, TFRs, and METARs), but the old data of other products is discarded. 1. While viewing the Connext Settings Menu, touch the Request Data key to manually request data. 2. Touch the Auto Request key to set the Auto Request Period. Touch To Select Request PeriodFigure 12-75 Select Auto Request Period190-01007-03-Final.indb 58 7/9/2015 2:08:15 PM
12-59190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex 3. Touch the Cancel Request key to cancel a request in progress.Touch To Select Request PeriodTouch To Cancel RequestTime Remaining Until Next RequestFigure 12-76 Cancelling A Request12.5.3.2 Connext Data Request Coverage RegionPresent Position Data Request Touch the Present Position key to request that weather information will be shown around your present position. Destination Connext Data Request Touch the Destination key to request that weather information will be shown around the destination waypoint in the flight plan. Flight Plan Data Request Touch the Flight Plan key to request that weather information will be shown around the active flight plan. Flight Plan Distance Data Request Touch the Distance key to request that weather information will be shown for the selected distance along the active flight plan. Waypoint Connext Data Request 1. Touch the Waypoint key to request that weather information will be shown around the selected waypoint. 2. Select the waypoint and then press ENT. Diameter/Route Width Connext Data Request After selecting a coverage option in the previous section, select the desired Diameter and then press ENT. 190-01007-03-Final.indb 59 7/9/2015 2:08:15 PM
12-60Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.5.3.3 Connext Weather Map Orientation 1. While viewing the Connext Weather Menu, touch the Orientation key. 2. Touch the orientation choices of North Up, Track Up, and Heading Up and to accept the displayed value and return to the Connext Weather Menu. Touch To Select Map OrientationFigure 12-77 Connext Weather Map Orientation190-01007-03-Final.indb 60 7/9/2015 2:08:16 PM
12-61190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.5.4 Register With ConnextIt is necessary to register the GTN with Connext to utilize the weather products. 1. Call Garmin Customer Service to create a Connext account. Provide the GTN System ID and airframe info (model, tail number, etc). 2. Customer Service will issue an access code to enter on the Connext Registration page. 3. While viewing Connext Settings Menu, touch the Datalink Status key. Touch To RegisterPhone and Datalink StatusCurrent Registration InfoIridium Signal LevelFigure 12-78 GSR 56 Status 4. Touch the Connext Registration key to display the Connext Registration display. Touch To RegisterTouch To Enter Access CodeCurrent Registration InfoFigure 12-79 Connext Registration Page190-01007-03-Final.indb 61 7/9/2015 2:08:16 PM
12-62Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex 5. Touch the Access Code key to enter the appropriate code and then touch the Enter key. 6. Touch the Register key to complete the process. The GTN will contact the Connext servers using the GSR 56 transceiver. If the access code and system ID are correct, it will download and display the airframe info. Deactivate Unit Registration With ConnextRegistration of the GTN unit with Connext can be deactivated so that the unit can no longer make requests to Connext. This does not cancel the subscription. 1. While viewing the Connext Registration display, touch the Access Code field and enter an invalid access code to deactivate the Connext registration. 2. Any weather requests will now fail and the system will no longer be linked to the Connext account. 12.5.5 Connext Weather Product AgeThe weather product expiration time and the refresh rate are shown in the following table. The refresh rate represents the interval at which Connext Satellites broadcast new signals that may or may not contain new weather data. It does not represent the rate at which weather data is updated or new content is received by the Data Link Receiver. Weather data is refreshed at intervals that are defined and controlled by Connext and its data vendors. Weather Product Expiration Time (Minutes)PRECIP 30Lightning 30IR Satellite 60SIGMETs / AIRMETs 60METARs 90Winds Aloft 90Pilot Weather Report (PIREP) (Blue - Regular, Yellow - Urgent)90Temporary Flight Restriction (TFR) 60Table 12-6 Connext Weather Products and Aging Times190-01007-03-Final.indb 62 7/9/2015 2:08:16 PM
12-63190-01007-03 Rev. JGarmin GTN 725/750 Pilot’s GuideForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/MusicUtilitiesSystemMessagesSymbolsAppendixIndex WARNING: Do not use the indicated data link weather product age to determine the age of the weather information shown by the data link weather product. Due to time delays inherent in gathering and processing weather data for data link transmission, the weather information shown by the data link weather product may be significantly older than the indicated weather product age. 12.5.6 TFRsTemporary Flight Restrictions (TFRs) provide detailed information for local short term restrictions. Figure 12-80 Connext TFR Legend 1. Touch a TFR symbol on the Weather page to view details. TFR DetailTouch TFR Symbol To View DetailsFigure 12-81 Connext TFR Detail 2. Touch the Back key to return to the Weather display. 190-01007-03-Final.indb 63 7/9/2015 2:08:16 PM
12-64Garmin GTN 725/750 Pilot’s Guide190-01007-03 Rev. JForewordGetting StartedAudio & Xpdr CtrlCom/NavFPLDirect-ToProcChartsWpt InfoMapTrafficTerrainWeatherNearestServices/ MusicUtilitiesSystemMessagesSymbolsAppendixIndex12.5.7 Precipitation (PRECIP) DataGraphical data is overlaid on the map indicating the rainfall detected by ground based radar for a specific area. The colors indicating increasing levels of rainfall progresses from light green for light rainfall to red for heavy rainfall. Review the Limitations section in the front of this guide for the limitations that apply to the Connext data. Rainfall data is color coded as follows: Figure 12-82 Connext PRECIP Weather Map Display and LegendThe "No Coverage" color indicates that no data is available for that area, and rainfall in that area is unknown. When weather data is received, the airborne system will display that data for 20 minutes. If no new data has been received for a given area, the rainfall will be removed after 20 minutes and the area will revert back to the "No Coverage" color. The Connext Weather Function is based on a ground-to-air data link and requires that the appropriate ground systems are broadcasting weather data and the aircraft is within reception range of the Ground Broadcast Transceiver (GBT). 12.5.7.1 Animating Precipitation Data NOTE: Animated Precipitation functionality is available in software version 6.00 and later. When Precipitation Data is enabled for display and more than two Precipitation images have been received by the GTN, the Precipitation display can be animated on the Connext Weather page. As new Precipitation images are 190-01007-03-Final.indb 64 7/9/2015 2:08:16 PM

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