Garmin G3X Touch Pilot's Manual page 360

AFCS
LOC Mode is activated when the automatic navigation source switch takes
place. If the APR Key is pressed or APPR is touched prior to the automatic
navigation source switch, LOC Mode is armed.
In the right circumstances, LOC and GS Modes can be armed while GPS
Mode is still active and the external navigator is set to GPS (not VLOC).
Arming LOC & GS Modes while GPS Mode is still active:
1) EXTERNAL NAVIGATOR: Tune and activate the desired localizer frequency.
2) EXTERNAL NAVIGATOR: Load the approach (LOC, ILS, LDA, SDF, etc.) into
the flight plan.
3) G3X Touch: While GPS is still the selected navigation source on the
external navigator, press the APR Key (GMC control unit) or touch APPR to
arm LOC and GS (Glideslope) Modes even with GPS Mode still active. The
external navigator will switch from GPS to VLOC automatically and the G3X
Touch will capture the localizer and then the glideslope.
If Navigation Mode is active and either of the following occur, the AFCS
reverts to Roll Hold Mode (wings rolled level):
• Different VOR tuned while in VOR Navigation Mode (VOR Navigation
Mode reverts to armed)
• Active navigation source manually switched
• Active flight plan is deleted (only GPS-based modes)
• GPS reception is lost
If VOR Navigation Mode is active and the VOR signal is lost, the autopilot
reverts to Roll Hold Mode (wings rolled level) and reverts VOR Mode to armed
in the event the VOR signal is reestablished.
OBS MODE
Enabling/disabling OBS Mode (without external GPS navigator):
1) While navigating a flight plan or Direct-to, touch CRS on the PFD.
2) Touch Yes on the 'Set OBS and hold?' window.
3) Enter the desired course to/from the waypoint using the keypad and touch
Enter.
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Garmin G3X Touch Pilot's Guide 190-01754-00 Rev. L