Garmin eTrex 1.1-Inch Portable GPS Navigator Global positioning system (GPS) receiver continuously tracks and uses up to 12 satellites Calculates current and average speed, time of sunrise and sunset, trip distance, and more Automatic track log; 10 saved tracks let you retrace your path in both directions Compatible with optional Garmin MapSource software for downloading trip and waypoint data Tough waterproof case; runs for 18 hours on 2 AA batteries