Garmin G3X Pilot's Manual page 354

AFCS
Pressing the TO/GA Button while in the air activates the flight director in a wings-
level, pitch-up attitude, allowing the execution of a missed approach or a go around.
Go Around Mode arms Selected Altitude Capture Mode automatically, and attempts to
modify the aircraft attitude (i.e., with the NOSE UP/DN Wheel or FMS Joystick) result
in reversion to Pitch and Roll Hold modes.
Go Around (GA) Mode Armed
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Garmin G3X Pilot's Guide 190-01115-00 Rev. K