Garmin G3X Touch Pilot's Manual page 130

CNS Interface
Selecting the Monitored Radio:
Touch the 'Audio' COM button on the CNS Data Bar to select/deselect a
monitored radio.
Or:
From the Main Menu, touch Audio Panel > Radios Tab and touch the
desired COM radios.
Selecting the Radio to transmit from:
Touch the MIC box on the CNS Data Bar to change the radio used to
transmit (talk) from.
Or:
From the Main Menu, touch Audio Panel > Radios Tab and touch the
desired COM MIC radios.
Selecting/Deselecting Split COM mode:
1) Touch Audio on the CNS Data Bar.
Or:
108
Garmin G3X Touch
Audio/Intercom Page, Radios Tab
™ Pilot's Guide for Certified Aircraft
190-02472-00 Rev. D