The GPS 12's rugged, waterproof case features military-tough construction, and its rocker keypad design provides true one-hand operation that keeps you on the move—day or night, rain or shine. It also features 500 available waypoints and 1024 track log points, nine proximity waypoints to mark and steer clear of dangerous areas, and GARMIN's innovative TracBack™ function—a feature that turns your track log into an instant breadcrumb trail and allows you to reverse your route in order to quickly navigate back home. As an added bonus, the GPS 12 also boasts a position averaging feature which diminishes the effects of Selective Availability (SA) upon position error and displays a value that reflects the estimated accuracy of the averaged position.