The Garmin eTrex 10 is easy to use, durable and waterproof, making it the most dependable GPS device available. It has a long battery life so you can spend more time enjoying the outdoors. Garmin has improved the user interface on the eTrex 10 and added a worldwide basemap, paperless geocaching and added support for spine mounting accessories. 2.2 in monochrome display that's easy to read in any lighting situation built to withstand the elements be it dust, dirt, humidity or water, none of which are a match for this storied navigator. Supports geocaching GPX files for downloading geocaches and details straight to your unit Stores and displays key information, including location, terrain, difficulty, hints and descriptions. high sensitivity, WAAS enabled GPS receiver and HotFix satellite prediction, eTrex 10 locates your position quickly and precisely and maintains its GPS location even in heavy cover and deep canyons first ever consumer grade receivers that can track both GPS and GLONASS satellites simultaneously. GLONASS is a system developed by the Russian Federation that will be fully operational in 2012.