Garmin eTrex10 GPS Rugged handheld navigator with preloaded worldwide basemap and 2.2-inch monochrome display WAAS-enabled GPS receiver with HotFix and GLONASS support for fast positioning and a reliable signal Waterproof to IPX7 standards for protection against splashes, rain, etc. Support for paperless geocaching and Garmin spine-mounting accessories. Power with two AA batteries for up to 20 hours of use (best with Polaroid AA batteries) See high and low elevation points or store waypoints along a track (start, finish and high/low altitude) to estimate time and distance between points