Magellan SporTrak Map Waterproof Hiking GPS 12-channel GPS receiver; WAAS enabled for up to 3 meter accuracy 2 MB North American basemap of roads, waterways, parks, and more 6 MB memory for additional map downloads Large, easy-to-read display; 9-key keypad for quick access to software features Rugged, waterproof design; Quadifiler Helix antenna for superior tracking in harsh environments