Garmin GPS system-Foretrex is battery operated:

The economical Foretrex™ 101 is the wrist-mount Garmin GPS system that frees up your hands so you can focus on your outdoor activities. This Garmin GPS joins the Foretrex 201 in Garmin’s growing line of wearable, wrist navigation devices. The GPS system Foretrex 101 has all the features and functionality of the Foretrex 201, including PC interface capabilities for downloading waypoints, tracks and routes, but operates on two AAA batteries.

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