The connector/pinout information may be applied to the Garmin model 12 XL
There is one pinout found for Garmin 12 XL .
The pinout (pin-out) is a cross-reference between the contacts (pins) of an electrical connector and their functions. The pin assignment diagram is listed below. Click for details
Garmin GPS 45, 12 XL, GPS II, III, V, 72, 76, 92, 176, 176c, 196, 295, StreetPilot III (round connector) pinout