With more than 985 million acres of public land and 240,000+ miles of roads and trails, including open dates and width restrictions, onX Offroad is a must-have app for any motorized enthusiast. @OnXOffroad Know before you go with the most trusted and accurate GPS satellite/topo trail mapping app. Turn your phone into the best off-road mapping tool for finding open dirt roads and trails, tracking your favorite routes, and making custom waypoints along the way. onX Offroad works using your phone’s GPS when you’re off-grid and offline—with full detail satellite imagery, open trails, and remote campsites all while out of cell service.