Garmin AC Adapter for GPS Navigators Garmin AC Adapter. This adapter allows you to connect your GPSIII+ series unit to an AC outlet. You can then download maps and information from your home PC to the GPS unit without wasting battery power. It also features a standard 4-pin connector. Allows You to Connect your GPS Unit to AC Power, Plugs Into Any Standard U.S. Based AC Power Receptacle; Saves on Batteries; Works with GPS V, GPS II Plus, GPSMAP 60C and GPSMAP 60CS.