Transponder Code And Mode Selection - Garmin G3X Touch Pilot's Manual

CNS Interface
Transponder tuning for panel mount transponders like GTX 327 (Mode C) is also
supported.

TRANSPONDER CODE AND MODE SELECTION

The transponder mode will automatically switch between GND Mode and ALT Mode.
Selecting a transponder code or mode:
1) Touch the transponder data box on the PFD.
2) Use the keypad to enter a code and touch Enter.
Or:
Touch STBY, GND/ALT, or ON to change the mode, and touch Enter.
136
Transponder Code, Mode, and Flight ID Entry
Garmin G3X Touch Pilot's Guide 190-01754-00 Rev. L