Garmin G3X Pilot's Manual page 330

AFCS
ALT/PTCH Softkey selected
HDG/ROLL
AP VNAV
or
AP APPR
AP VS
AP ALT
ALT/PTCH
FMS J
oyStiCk
Moving the FMS Joystick up/down adjusts the mode reference for Vertical Speed
(VS), Altitude Hold (ALT), and Pitch Hold (PIT) modes.
Moving the FMS Joystick left/right adjusts the mode reference for Roll Hold (ROL)
mode. The FMS Joystick cannot be used to increase the roll reference bank angle, only
to drive the aircraft towards wings-level.
The following AFCS controls are located separately from the GDU softkeys and GMC
305 AFCS Control Unit:
308
Initial press allows the pilot to adjust the heading bug
and displays lateral mode softkeys; subsequent press
returns to top-level softkeys
Selects/deselects vertical navigation
Selects/deselects approach mode
Selects/deselects vertical speed mode
Selects/deselects altitude hold mode
Initial press allows the pilot to adjust the selected altitude
and displays the vertical mode softkeys; subsequent
press returns to top-level softkeys
Garmin G3X Pilot's Guide 190-01115-00 Rev. K