Magellan Triton 400 Waterproof Hiking GPS Memory Boost: Storing data, including additional maps, terrain, and geocache data is easy with the Triton 400s SD card slot 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