eTrex 10 retains the core functionality, rugged construction, affordability and long battery life that made eTrex the most dependable GPS device available but has improved on the user interface and added a worldwide basemap, paperless geocaching and support for spine-mounting accessories. eTrex 10 has an enhanced 2.2" monochrome display that's easy to read in any lighting situation. Both durable and water resistant, eTrex 10 is built to withstand the elements. Its easy-to-use interface means you'll spend more time enjoying the outdoors and less time searching for information. eTrex 10 features the legendary toughness that's built to withstand the elements. Dust, dirt, humidity, water — none are a match for this navigator. It also supports geocaching GPX files for transferring geocaches. Visit OpenCaching to start your geocaching adventure. By going paperless, you're not only helping the environment but also improving efficiency. eTrex 10 stores and displays key information, including location, terrain, difficulty, hints and descriptions, which means no more manually entering coordinates and paper printouts. Simply upload the GPX file to your eTrex 10 and start hunting for caches. With its 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. Whether you're in deep woods or just near tall buildings and trees, you can count on eTrex 10 to help you find your way when you need it the most. eTrex devices are the first-ever consumer-grade receivers that can track both GPS and GLONASS satellites simultaneously. When using GLONASS satellites, the time it takes for the receiver to "lock on" to a position is (on average) approximately 20 percent faster than using GPS. And when using both GPS and GLONASS, the receiver has the ability to lock on to 24 more satellites than using GPS alone.