The Foretrex 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 hikers, skiers and campers. To share data easily, you can connect Foretrex to your computer with USB or just send data wirelessly to another device.Retrace Your StepsNo 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 always can 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.Features high-sensitivity GPS receiver with HotFix for improved performance and reception in heavy tree cover or deep canyonsKeeps track of routes, tracks and waypoints, and heart rate with add on heart rate monitor (sold separate). Uses standard AAA batteries. 2 required.TracBack feature retraces user's path on the easy-to-read LCD displaySupports dual position readout so user can view current location in multiple formatsFeatures trip computer, sunrise/sunset times, hunting/fishing information, electronic compass and barometric altimeter