Garmin G3X Touch Pilot's Manual page 136

CNS Interface
Touch Marker Beacon on the Audio/Intercom Page (Radios Tab) to select/deselect
the marker beacon audio. The Marker Beacon Button annunciator indicates when
marker beacon audio is selected.
NOTE: The Speaker Button is moved under 'More Options...' when both
Marker Beacon and Speaker are enabled.
Touch Marker Sensitivity on the Audio/Intercom Page (Radios Tab) > More
Options... to switch between High and Low marker beacon receiver sensitivity. High
is used to provide an earlier indication when nearing a marker during an approach.
Low results in a narrower marker dwell while over a station.
116
Marker Beacon Audio
Garmin G3X Touch Pilot's Guide
Marker
Beacon Audio
190-01754-00 Rev. L