Compact, rugged, waterproof, powerful, ergonomic full-featured design. 12 parallel-channel receiver. WAAS enabled for up to 3 meter positioning accuracy. Quadifiler Helix antenna for superior tracking in harsh environments. 9 key keypad with large easy-read display. 7 navigation screens. 8 MB North American base map of highways, major roads, parks, waterways, marine navaids, buoys, lighthouses & more. 24MB of built-in memory for downloading detailed maps from the MapSend line of CD's. Uses 2 AA batteries, Not included. Rubber armored impact-resistant plastic construction. PC Cable and User's Manual included.