Cammenga’s Destinate Model D3-T Tritium Protractor Compass incorporates all the same parts and materials as the Model 3H Tritium Lensatic Compass, the official U.S. Military Compass. Built upon a transparent nylon baseplate and waterproof housing, the Model D3-T features 6 tritium micro lights to allow for navigation in low-light conditions without the use of an external light source; tritium micro lights remain luminous for over 12 years. The D3-T features a Copper Induction Damping System which slows the rotation of the magnet without the use of liquids. The D3-T also comes equipped with a map magnifying lens, dial graduations in both degrees and mils, and 3 map scales (1:25K, 1:63.36k, 1:50km) for navigation on a variety of maps. Made in the USA.