Magellan SporTrak Pro Marine 2.2 x 1.33-Inch Waterproof Marine GPS 12-channel handheld GPS receiver for boating and outdoor use; WAAS-enabled for 3-meter accuracy 15 MB built-in mapping database of North America, including highways, major roads, parks, waterways, and more 17 MB memory for additional map storage Store up to 20 routes, 500 waypoints and 2,000 track-points Built-in information for major tide station; fish and game calculator