The SWIV is a dual-purpose compass. The convenient side scan 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 SWIV is designed with a half black / half luminous graphic to make quick work of compass direction, especially in dim light. The dial rests on a precision jeweled bearing and incorporates extremely strong magnets for super quick response and accuracy. While the SWIV module itself is very compact, the housing has a large vertical interior allowing viewing angles that would stop other compasses in their tracks. 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 comes with a durable rubber wrist boot.