GPS receivers connectors  > Garmin pinouts
Pin Name
1 DATA RX into the unit (RS232 Rx)
2 DATA TX from the unit (RS232 Tx)
3 GROUND
4 Vcc (8 to 40 V) read manual before for the maximum allowed. Most of GPS units may be charged with +12V power supply (for example from car cigarette lighter connector)
4 pin Garmin round proprietary of Garmin GPS 45, 12 XL, GPS II, III, V, 72, 76, 92, 176, 176c, 196, 295, StreetPilot III (round connector) connector layout
4 pin Garmin round proprietary connector
at the GPS unit
According to 13 reports in our database (11 positive and 2 negative) this pinout should be correct.

Is this pinout
Garmin GPS 45, 12 XL, GPS II, III, V, 72, 76, 92, 176, 176c, 196, 295, StreetPilot III (round connector) visual pinout:
Garmin GPS 45, 12 XL, GPS II, III, V, 72, 76, 92, 176, 176c, 196, 295, StreetPilot III (round connector) diagram
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Source(s) of this and additional information: www.garmingps.com, gpsinformation.net and others
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