Cammenga 27 Phosphorescent Compass can be used to determine azimuths or bearings, orient a map, determine location of a terrain feature or follow a course. Phosphorescent self-illumination makes navigation after dark easier. Dial is graduated in degrees and mils. Ruled scale helps plot a course. Waterproof aluminum-cast housing. Includes nylon lanyard and carry case.Manufacturer model #: 27CS. Phosphorescent self-illumination Graduated in degrees and mils Ruled scale helps plot a course Waterproof aluminum-cast housing Includes nylon lanyard and carry case