Garmin G3X Pilot’s Guide 190-01115-00 Rev. J336Annunciations & AlertsSystemOverviewFlightInstrumentsEISCNSInterfaceGPSNavigationFlightPlanningHazardAvoidanceAdditionalFeaturesIntegratedAutopilotAnnun AlertsAppendixIndex10.3 AURAL ALERTS• “Five Hundred”—when the aircraft descends through 500 feet above the destina-tion airport.The following aural terrain alerts are issued when flight conditions meetparameters that are set within the software algorithms, and are dependent onthe sensitivity level set in the Terrain Setup Menu.Alert Severity Terrain Obstacle Descent RateCaution“caution, terrain”“caution, terrainahead”“caution, obstacle”“caution, obstacleahead”“caution, sinkrate”Warning“terrain ahead! pullup!”“terrain! terrain! pullup! pull up!”“obstacle ahead! pullup!”“obstacle! obstacle!pull up! pull up!”“sink rate, pullup!”“pull up!”Aural Alerts Summary10.4 PFD ANNUNCIATIONS AND ALERTINGFUNCTIONSThe following annunciations and alerting functions are displayed on the PFD.UNCERTAIN HEADINGIf the G3X senses that the magnetic heading measurement is valid, but possiblyoutside of the internal accuracy limits, the numeric heading value on the PFD is displayin yellow. When the system heading is uncertain, features that use heading data maynot be available (e.g., autopilot HDG mode or PFD wind calculations). An uncertainheading value can be caused by magnetic anomalies or installation/calibration issues.Refer to the G3X installation manual for installation and calibration information forthe magnetometerUncertain Heading
