This well constructed compass is an oil filled compass, robust and accurate for underwater navigation that ensures accuracy and durability for a long time. The compass is a dual purpose compass. The convenient side window allows quick reference of large, easy-to-read bearing indicators on a luminescent display for gun-sight accuracy. Or, for divers who prefer relative navigation, the ratchet bezel can be rotated easily even with thick neoprene gloves. The luminous dial of the compass is designed with a half black / half luminous graphic to make quick work of compass direction, especially in dim light . . . The compass bezel has compass headings in 30° numbered increments and indicator marks for every 10°. Bezel has twin heading indicators for alignment of compass course and a lubber line across the compass face. Compass case is manufactured from a scratch resistance polycarbonate for strength and durability.