High-sensitivity GPS receiver with HotFix(R) for improved performance & reception in heavy tree cover or deep canyons; Electronic compass & barometric altimeter; Keeps track of path & displays as a dotted trail; TracBack(R) navigation to retrace path; Ability to create & store routes plus save waypoints; Trip computer, sunrise/sunset times & hunting/fishing information; Supports dual-position readout; Users can wirelessly share routes, tracks & waypoints between other 401 devices; Compatible with Garmin(R) 010-10997-00 & 010-10997-07 heart rate monitors; Water-resistant (IPX7); Connects to a computer via USB interface, compatbile with Garmin Connect(TM); Battery life up to 17 hours in navigation mode; Requires 2 AAA batteries; Includes wrist expansion straps & USB cable;