Magellan Triton 500 Waterproof Hiking GPS Accurate Bearings: A simple-to-use, 3-axis electronic compass delivers stationary heading and bearing at any altitude Weather Predictions: An embedded barometer allows customers to track pressure and altitude changes Memory Boost: Storing data, including additional maps, terrain, and geocache data is easy with the Triton 500s SD card slot Detailed Maps: Pre-loaded base maps and compatible third-party maps identify major rivers, lakes, cities, and other geographical boundaries Crystal Clear Graphics: 2.2" (5.59 cm) full-color display delivers vivid imagery in the field.