4 pin connector, found on the back cover.
Pin Name cable color
1V+ (power in)maximum of 3.15V, recommended 3V
2data in (RS232 Rx)green
3data out (RS232 Tx)white
4groundblack
4 pin Garmin proprietary of Garmin GPS eTrex, eMap, Geko connector connector layout
4 pin Garmin proprietary connector
at the back of unit
According to 10 reports in our database (9 positive and 1 negative) this pinout should be correct.

Is this pinout
Garmin GPS eTrex, eMap, Geko connector visual pinout:
Garmin GPS eTrex, eMap, Geko connector diagram
click to enlarge
Source(s) of this and additional information: www.garmingps.com
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