Garmin Foretrex 401, The Foretrex 401 is a slim wrist-mounted GPS navigator perfect for outdoor activities that require the use of both hands. Foretrex 401 combines a high-sensitivity waterproof GPS receiver, electronic compass and barometric altimeter into a lightweight device ideal for military personnel. To share data easily, you can connect Foretrex to your computer with USB or just send data wirelessly to another device. Retrace Your Steps No matter where your adventure takes you, you'll never worry about getting lost with the Foretrex 401. Foretrex keeps track of your path and displays it as a dotted trail on the screen. Just turn on Foretrex's TracBack® feature, and you can retrace your path back to where you started. Keep track of your bearing and altitude with Foretrex 401's electronic compass and barometric altimeter. You can save locations in memory as waypoints, so you can always find your way back to any important place, like your campsite or vehicle. And with up to 17 hours of battery life and replaceable AAA batteries, you'll never worry about making it back.