Altimeters are a great multi-use tool. Perfect for hikers and bicyclist, the altimeter can be used to verify one's location and altitude, often more accurately than a GPS (also, altimeters won't run out of battery power while you are out on the trail). As many experienced backpackers know, an altimeter is a valuable asset while out exploring the depths of forest. The US Outdoor Store has a verity of altimeter watches that will help keep you on track. Getting lost on a hike without one would be a silly as, well, leaving behind your compass. Also, save with Free Shipping and No Sales Tax on orders of $40 or more within the contiguous United States.