Garmin G3X Pilot's Manual page 272

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
Prior to descent path interception, the Selected Altitude must be set below the
current aircraft altitude by at least 75 feet. For transition from Altitude Hold to
VNAV Mode to take place, acknowledgement is required within 5 minutes of
descent path interception by pressing the AP VNAV Softkey or adjusting the
Selected Altitude.
If acknowledgement is not received within 1 minute of descent path interception,
the white 'VNAV' annunciation starts to flash. Flashing continues until
acknowledged or the descent path is intercepted. If the descent is not confirmed
by the time of interception, VNAV Mode remains armed and the descent is not
captured.
➌
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.
➍
When approaching the VNAV Target Altitude (or Selected Altitude) the system
automatically transitions to ALTS or ALTV Mode with ALT Mode armed.
254
➊
Garmin G3X Pilot's Guide
Selected
Altitude
➋
➌
➍
190-01115-00 Rev. F