Garmin G3X Pilot’s Guide190-01115-00 Rev. K337AFCSSystemOverviewFlightInstruments EISCNSInterfaceGPSNavigationFlightPlanningHazardAvoidanceAdditionalFeatures AFCS Annun/Alerts Appendix IndexNAVIGATION MODES (GPS, VOR, LOC, BC)NOTE: The selected navigation receiver must have a valid VOR or LOC signalor active GPS course for the flight director to enter Navigation Mode.NOTE: When intercepting a flight plan leg, the flight director gives com-mands to capture the active leg at approximately a 45° angle to the trackbetween the waypoints defining the active leg. The flight director does notgive commands fly to the starting waypoint of the active leg.NOTE: When making a backcourse approach, set the Selected Course to thelocalizer front course.Pressing the NAV Key or AP NAV Softkey selects Navigation Mode. NavigationMode acquires and tracks the selected navigation source (GPS, VOR, LOC). The flightdirector follows GPS roll steering commands when GPS is the selected navigationsource. When the navigation source is VOR or LOC, the flight director creates rollsteering commands from the Selected Course and deviation. Navigation Mode canalso be used to fly non-precision GPS and LOC approaches where vertical guidance isnot required.Backcourse Navigation Mode is selected when the localizer front course is greaterthan 105° from the aircraft heading. Backcourse Navigation Mode captures and tracksa localizer signal in the backcourse direction. The annunciation ‘BC’ in the AutopilotStatus Box indicates Backcourse Navigation Mode.If the Course Deviation Indicator (CDI) shows greater than one dot when the NAVKey or AP NAV Softkey is pressed, the selected mode is armed. If the CDI is less thanone dot, Navigation Mode is automatically captured when the NAV Key or AP NAVSoftkey is pressed. The armed annunciation appears in white to the left of the activeroll mode.Navigation Mode Annunciation
