Garmin GDU™ 37X Pilot’s Guide 190-01054-00 Rev. E142Hazard AvoidanceOverviewGPS NavigationFlight PlanningHazard AvoidanceAdditional FeaturesAppendicesIndexTERRAIN AND OBSTACLE COLOR CODERed—terrain or obstacle is above the aircraft, or within 100 feet below the aircraft.Yellow—terrain or obstacle is between the user-defined Caution Elevation and 100feet below the aircraft.Enabling/Disabling Terrain Shading on the Map Page:From the Map Page with the VFR Map displayed, press the TERRAINSoftkey.Or:1) From the Map Page, press the MENU Key.2) Turn or move the FMS Joystick to highlight ‘Set Up Map’, and press theENT Key.3) Turn the FMS Joystick to highlight the ‘Map’ Category from the horizontallist.4) Move the FMS Joystick to highlight the ‘Terrain Shading’ field.5) Turn the FMS Joystick to select ‘On’ or ‘Off’, and press the ENT Key.TERRAIN ALERTS & SETUPUse the Terrain Setup Menu to set levels for terrain alerts as well as obstacles inor near your flight path.• Caution Elevation—The GDU 37X will provide an alert if the terrain or obstacle iswithin the default Caution Elevation or user-defined Caution Elevation• Look Ahead Time—Determines the maximum time when an alert annunciationoccurs. For example, if 120 seconds is selected, the GDU 37X provides an alert upto 120 seconds before you reach the terrain or obstacle• Alert Sensitivity—The three Alert Sensitivity settings (Terrain, Obstacle, andDescent Rate) determine what level of alerts are annunciated. The GDU 37Xdefaults to ‘High’ sensitivity, which annunciates all red and yellow alerts at thetime set in Look Ahead Time. ‘Medium’ sensitivity annunciates all of the red
