Magellan Triton 300 Waterproof Hiking GPS Pre-loaded base maps and compatible third-party maps identify major rivers, lakes, cities, and other geographical boundaries 2.2" (5.59 cm) full-color display delivers vivid imagery in the field. Extremely rugged and waterproof to IPX-7 standards AA batteries provide a readily available power source SiRFstarIII delivers the fastest GPS position acquisition in the industry