Garmin G3X Pilot's Manual page 300

Integrated Autopilot
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: While GPS is still the selected navigation source on the external
navigator, press the AP APPR Softkey 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 will capture the localizer and
then the glideslope.
If Navigation Mode is active and either of the following occur, the Integrated
Autopilot 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 (with the CDI SRC
Softkey on the PFD/PFD Page, or the CDI Key on the external navigator)
• 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 Integrated
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
In OBS Mode the Selected Course is controlled using the OBS CRS Softkey.
Or press XPDR/CRS > OBS CRS when a transponder is configured.
Enabling/disabling OBS Mode (without external GPS navigator):
1) From the Active Flight Plan Page, press the MENU Key while navigating a
flight plan or Direct-to.
2) With 'Set OBS and Hold' highlighted, press the ENT Key. The OBS Mode
Box is highlighted.
3) Turn the FMS Joystick to select the desired course to/from the waypoint.
4) To cancel OBS Mode and return to automatic waypoint sequencing, press
the MENU Key, with 'Release Hold' highlighted, press the ENT Key.
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Garmin G3X Pilot's Guide 190-01115-00 Rev. G