Provides precise GPS positioning using correction data obtained from the WASS. Built-in quad helix antenna for superior reception and can provide position accuracy to less than three meters when receiving WAAS corrections. 8MB internal memory capacity with a built-in basemap of cities, coastlines, lakes, rivers, interstates, and a database of nautical navaids such as lights, buoys, sound signals and day beacons. Preloaded with tide data for the USA. 1.6"W x 2.2"H display. Waterproof case. Floats if accidentally dropped in the water.