Magellan Crossover 3.5-Inch Portable GPS Navigator Combines all the standard features of the advanced Magellan auto navigation GPS with topo maps Large, easy-to-read, 3.5-inch diagonal touch-screen Mark waypoints along the a hiking trail to mark your personal points of interest Dimensions: 1.2 x 3.46 x 4.28 inches (W x H x D); weighs 2.2 pounds The 8 hour battery life is highest in it's class.