Garmin GFC 600 Pilot's Manual page 11

The GMC 605 has extensive I/O capabilities that support interfaces to a large variety
of equipment including Primary Flight Displays, Air Data Computers, GPS navigators,
VHF Nav radios, Audio Panels, HSIs, and Directional Gyros (DGs). The GMC requires
airspeed and altitude information, therefore if it does not have an interface to an Air
Data Computer, a small Air Data Module must be attached to the back of the GMC's
mounting tray to provide basic air data information to the AFCS.
The GMC 605 features a covered USB port on the front face of the unit, allowing a
convenient means of updating software and downloading diagnostics information to
aid in troubleshooting.
CAUTION:
consumer devices such as smart phones, cameras, or tablet computers and
should not be used in flight.
190-01488-00 Rev. B
The USB port is not designed to provide power or data to external
GMC 605
Garmin GFC 600 Pilot's Guide
System Overview
3