Garmin eTrex? 20 GPS handheld Rugged handheld navigator with preloaded worldwide relief basemap and 2.2-inch color display WAAS-enabled GPS receiver with HotFix and GLONASS support for fast positioning and a reliable signal Compatible with topographic, marine and road maps.TOPO U.S. 24K, BlueChart g2, City Navigator, etc. Powered with two AA batteries; waterproof to IPX7 standards for protection against splashes, rain, etc Support for paperless geocaching and Garmin spine-mounting accessories,Automatic routing (turn by turn routing on roads) with optional mapping for detailed roads