Take on the trails with Colorado 400t Portable Navigator. This rugged, advanced handheld is packed with detailed topographic maps for all your hiking adventures not to mention 3-D map view, a high-sensitivity receiver, barometric altimeter, electronic compass, SD card slot, picture viewer and color display. Exchange tracks, waypoints, routes and geocaches wirelessly between similar units. When the going gets tough, Colorado leads the way.Colorado features a Rock 'n' Roller input wheel for easy one-handed operation and supports Geocaching's GPX files for downloading geocaches and detail straight to your unit. Customize Colorado's interface based on your favorite activity. Even show off photos of your excursions with its picture viewer. Slim, lightweight and waterproof, Colorado is the perfect companion for all your outdoor pursuits.Colorado 400t has a built-in electronic compass that provides bearing information even while you're standing still, and its barometric altimeter tracks changes in pressure to pinpoint your precise altitude. You can even use the altimeter to plot barometric pressure over time, which can help you keep an eye on changing weather conditions.Conveniently plug in optional preloaded SD cards for all your outdoor activities on land or water. Just insert a MapSource card with detailed street maps, and Colorado provides turn-by-turn directions to your destination. The card slot is located inside the waterproof battery compartment, so you don't have to worry about getting it wet.