Most Dependable GPS Device Available eTrex 10 retains the core functionality, rugged construction, affordability and long battery life that made eTrex the most dependable GPS device available. We improved the user interface and added a worldwide basemap, paperless geocaching and support for spine-mounting accessories. See the Way eTrex 10 has an enhanced 2.2" monochrome display that’s easy to read in any lighting situation. Both durable and waterproof, 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, humid.