Garmin G3X Pilots Guide - Page 291
Approaches with Lateral + Vertical Guidance
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System Overview Flight Instruments EIS CNS Interface GPS Navigation Integrated Autopilot Backcourse Mode captures and tracks a localizer signal in the backcourse direction. Backcourse is indicated by 'BC' in the autopilot status box. If GS and LOC Mode are armed, the autopilot can only capture the localizer front course, indicated by 'LOC' in the autopilot status box. If only LOC Mode is armed (not GS Mode), the autopilot will capture either the front course or the backcourse based on the angle at which the aircraft intercepts the localizer. Selecting BC Mode: 1) EXTERNAL NAVIGATOR: Tune and activate the desired LOC frequency. 2) G3X: Ensure that LOC1 is the selected navigation source on the (use the CDI SRC Softkey on the PFD or PFD Page to cycle through external navigation sources if necessary). The HSI should automatically slew the needle to the correct course. 3) G3X: From the PFD or PFD Page, press the HDG/ROLL Softkey to access the autopilot lateral modes and then press the AP NAV Softkey. If the aircraft heading is within 75˚ of the localizer backcourse then BC Mode will be armed. If the aircraft heading is within 105˚ of the localizer front course, LOC Mode will be armed. If BC mode is armed and the heading exceeds 75˚ of the localizer backcourse for 20 seconds, the autopilot will switch from BC to LOC mode. If LOC mode is armed and the heading exceeds 105˚ of the localizer front course for 20 seconds, the autopilot will switch from LOC mode to BC mode. Once BC mode or LOC mode become active, the autopilot will not switch between LOC and BC modes regardless of the heading. APPROACHES WITH LATERAL + VERTICAL GUIDANCE Press the AP APPR Softkey to arm/activate both lateral and vertical modes for approach. When Glidepath (GP) Mode is armed for a GPS approach with vertical guidance, GPS Mode is automatically armed. When Glideslope (GS) Mode armed for an ILS approach, LOC Mode is automatically armed. Press the AP APPR Softkey when the CDI is greater than one dot to arm the selected modes (annunciated in white). Press the AP APPR Softkey when the CDI deviation is less than one dot to activate, capture and track the selected navigation source. Flight Planning Hazard Avoidance Additional Features Integrated Autopilot Annun/Alerts Appendix Index 190-01115-00 Rev. F Garmin G3X Pilot's Guide 273