The Garmin Foretrex 401 is a simple and convenient way to navigate. This wrist-mounted unit features 500 waypoint capability, allowing you to mark favorite spots and landmarks. The electronic compass features a 2-axis design, allowing you to easily navigate and find directional information. The barometric altimeter helps this unit track your precise location, using changes in barometric pressure. This feature also allows you to keep an eye on ever-changing weather conditions by tracking barometric pressures over time.You'll never have to worry about wet weather ruining your unit. With its weatherproof design, the Foretrex 401 will stay dry and functional, is submersible to 1 meter for 30 minutes and floats. The Foretrex 401 is best powered by 2 lithium AAA batteries and features a runtime of up to 17 hours. This handy little unit also features hunt/fish calendars and sun/moon information, to give you the best data for your hikes, hunts and fishing trips. The high-sensitivity GPS receiver ensures maximum reception and precise location placement. The Garmin Connect system allows you to track your past activities and helps you plan future treks on a map using Google Earth. The Foretrex 401 also allows you to share information wireleslly with compatible units.