Can a Garmin Portable GPS be used as a Position Source for the GTR 225 and GNC 255?

Some functions, including searching for the nearest frequencies, require GPS input. Garmin portable devices can be used to provide this (NMEA) information. An appropriate bare wires cable would need to be installed by your avionics technician. Once connected properly, the Garmin portable GPS will need to be interfaced properly. Please see the Pilot’s Guide of your GPS for further details on the interface setting.