Amazon.com With the state-of-the-art 3D elevation perspective and preloaded topographic map data of the U.S., the rugged Oregon 400t provides all the tools you need for serious climbing, hiking or hunting. This high-sensitivity GPS receiver is preloaded with topographic maps, and features a high-resolution, color 3-inch touchscreen that reacts as you tap or drag through menus and options. With its high-sensitivity, WAAS-enabled GPS receiver and HotFix satellite prediction, ...