Cammenga Tritium Protractor Compass D3-TDestinate Protractor Baseplate Compass. Measures 4 3 4" x 2 1 2" x 7 8". Equipped with 6 Tritium micro lights, it provides continuous illumination for over 12 years. Take and transfer bearings, calculate declinations and triangulate with the ultimate confidence. Accuracy provides the efficiency and speed needed to navigate any terrain. Features map magnifying glass. 4 map scales for easy navigation on a variety of maps. Dial graduations in both