The U.S. Department of Defense has purchased 19,659 new GPS receivers for the troops, at a cost of some $2,300 each. Each DAGR (Defense Advanced Global Positioning System Receiver) weighs nearly a pound (15 ounces), but is small enough (6 3/8 x 3 7/16 x 1 9/16) to fit into a standard two-clip ammo pouch. DAGR can get its first position fix within 60 seconds, and can run continuously for twelve hours on its battery. There are a number of useful accessories, including an anti-jamming device, a more powerful antenna and external power cables. DAGR has one major advantage over commercial GPS receivers, it can use the Precise Positioning Service (PPS) signal. PPS allows users to operate reliably when someone is trying to jam GPS signals. DAGR also has the most popular features found in commercial GPS receivers, and can easily have its software updated. DAGR has a 1.7x2.3 inch display, and can survive submersion into nearly 40 inches of water. DAGR costs about five times more than equivalent civilian models.