Garmin G3X Pilot's Manual page 98

Flight Instruments
Selected Altitude Bug
Barometric Setting
BAROMETRIC PRESSURE
The barometric pressure setting is displayed below the Altimeter in inches of mercury
(in Hg) or hectopascals (hPa) when metric units are selected.
Selecting the altimeter barometric pressure setting:
1) From the PFD Page (one display) or PFD (two display), press the BARO
Softkey to highlight the barometric pressure setting.
2) Turn the FMS Joystick to display the desired barometric pressure setting
and press the ENT Key.
Syncing to the local barometric pressure setting:
1) From the PFD Page (one display) or PFD (two display), press the BARO
Softkey.
2) While stationary on the ground, press and hold the FMS Joystick.
3) Verify indicated altitude matches local field elevation.
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Altimeter
Garmin G3X Pilot's Guide
Selected Altitude
Vertical Speed Indicator
190-01115-00 Rev. K