Garmin G3X Pilot's Manual page 324

Integrated Autopilot
Activating Vertical Navigation Mode:
➊
When a flight plan is active, VNAV data is valid, and the AP VNAV Softkey is
pressed, VNAV mode is armed in preparation for descent path capture. 'VNAV' is
annunciated in white in the G3X Autopilot Status Box. If applicable, the appropriate
altitude capture mode is armed for capture of the VNAV Target Altitude (ALTV) or
the Selected Altitude (ALTS), whichever is greater.
➋
When a descent leg is captured (i.e., vertical deviation becomes valid), VNAV Mode
is activated and tracks the descent profile. An altitude capture mode (ALTS or ALTV)
is armed as appropriate.
➌
When approaching the VNAV Target Altitude (or Selected Altitude) the system
automatically transitions to ALTS or ALTV Mode with ALT Mode armed.
If the altimeter's barometric setting is adjusted while VNAV mode is active, the
Integrated Autopilot increases/decreases the descent rate by up to 500 fpm to re-
establish the aircraft on the descent path (without commanding a climb). For large
changes, it may take several minutes for the aircraft to reestablish on the descent
path. If the change is made while nearing the VNAV waypoint, the aircraft may not
reestablish on the descent path in time to level off at the VNAV Target Altitude. In this
case, the Integrated Autopilot will revert to Pitch Hold mode upon passing the VNAV
waypoint, and Selected Altitude Capture (ALTV) mode will be automatically armed.
304
Garmin G3X Pilot's Guide
➊
➋
➌
Selected
Altitude
190-01115-00 Rev. J