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4 pin Garmin round proprietary connector layout
4 pin Garmin round proprietary connector
at the GPS unit
The pinout should fit 56 devices/models. Click to list>
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)

For GPS45, GND is pin 2, power is pin 4? 

Pinout status: +13 -2
According to 16 reports in our database (13 positive and 2 negative) the Garmin GPS 45, 12 XL, GPS II, III, V, 72, 76, 92, 176, 176c, 196, 295, StreetPilot III (round connector) pinout should be correct.

Is this pinout
NO DIY devices
Garmin GPS 45, 12 XL, GPS II, III, V, 72, 76, 92, 176, 176c, 196, 295, StreetPilot III (round connector) visual pinout:click to enlarge
Source(s) of this and additional information: www.garmingps.com, gpsinformation.net and others
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