Barometric altimeter determines current elevation and ascent/descent rate with 10' accuracy 2" x 1" LCD screen with backlight 24MB internal memory with built-in marine point database and Americas basemap Electronic compass accurate within 2° WAAS-enabled GPS receiver accurate within 3m IPX7 waterproof 2" W x 4 7/16" H x 1 3/16" D Requires 2 AA batteries (not included) Includes PC interface cable and wrist strap Brand New Full Manufacturer's Warranty