The Garmin inReach Explorer+ satellite communicator is a GPS tracker, navigation tool, 2-way satellite messenger and SOS device all in one. BATTERIES Rechargeable internal lithium ion. DIMENSIONS 6.5 x 2.7 x 1.5 inches. WEIGHT 7.5 ounces. Stay connected off-grid "Unplugging" when you venture into the backcountry doesn't have to mean sacrificing safety. This 2-way satellite communicator lets you text, share your location or call for help, even in areas without cell reception. Preloaded topo maps Locate yourself on a topographic map, drop a waypoint in the distance, and plot a course—then use your breadcrumb trail to find your way back when it's time to bring your adventure to a close. Smart sensors to help you find your way.