Garmin G3X Touch Pilot's Manual page 28

System Overview
• GMC 507 (AFCS Mode Controller)
Automatic Flight Control System (AFCS) Mode Controller. The GMC 507 provides a
–
user interface for the autopilot and flight director function of the G3X system.
• GTR 20 (VHF Communications Radio)
A remote-mounted VHF COM transceiver that operates in the 118.000 to 136.975
–
MHz frequency range with a 25 kHz channel spacing. The GTR 20 features a built-
in two-place stereo intercom with alert audio, 3D audio, and stereo music inputs.
– Fully controlled by G3X Touch displays.
6
Garmin G3X Touch
GMC 507
GTR 20
™ Pilot's Guide for Certified Aircraft
190-02472-00 Rev. D