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 & barometric altimeter into a lightweight device ideal for hikers, skiers, campers & military personnel. To share data easily, you can connect Foretrex to your computer with USB (Universal Serial Bus) or just send data wirelessly to another device. No matter where your adventure takes you, you'll never worry about getting lost with the Foretrex 401. Foretrex keeps track of your path & displays it as a dotted trail on the screen. Just turn on Foretrex's Trac Back feature, & you can retrace your path back to where you started. Keep track of your bearing & altitude with Foretrex 401's electronic compass & 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. & with up to 17 hours of battery life & replaceable AAA batteries, you'll never worry about making it back. Foretrex 401 lets you create & store routes to all of your favorite places & provides other helpful information, including a trip computer, sunrise/sunset times & hunting & fishing information. For even more data, connect Foretrex 401 to a wireless accessory, such as a heart rate monitor, cadence sensor, or clip it on your bike with the accessory bike mount (all optional accessories, not included). To keep track of your trip, connect your Foretrex to your PC or Mac with USB (Universal Serial Bus) to store your waypoints, routes & tracks on your computer. You also can share waypoints, routes & tracks wirelessly with certain Foretrex, Oregon & Colarado devices.