eTrex 10 has an enhanced 2.2" monochrome display thats easy to read in any lighting situation. Its easy-to-use interface means you'll spend more time enjoying the outdoors and less time searching for information. eTrex 10 features supports geocaching GPX files for transferring geocaches. eTrex 10 stores and displays key information, including location, terrain, difficulty, hints and descriptions. 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. eTrex devices 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.