Upgrades over the eTrex 10 include the 2.2" 65K color TFT display with 176x220-pixel resolution. Pre-loaded worldwide basemap supports Garmin custom maps and BirdsEye™ satellite imagery. Add optional mapping software via the micro SD card slot. High-sensitivity, WAAS-enabled GPS receiver with HotFix™ quickly acquires satellite locations. Compatible with
spine-mounted accessories. Connect to your computer with the USB interface. Powered by two AA batteries (not included) for up to 20 hours. Includes: eTrex 20, case, topo 100K card and USB cable. Dimensions: 3.9"H x 2.1"W x 1.3"D. Weight: 5 oz. for GPS unit only.