Preloaded with approximately 250,000 geocache locations covering all 50 states. Simply turn on the unit and it will navigate you to your current location's closest geocache; press a button and it directs you to the next closest cache. Create your own geocache locations, too. Displays compass heading, latitude, and longitude. Splash-proof polyethylene. Requires 2 AAA batteries (not included). 4"L x 2"W (10 cmx 5 cm); 3.2 oz (91 g). Update Kit (sold separately) keeps your list of geocache locations current.