Mares Mission - The Compass is oil filled for a quick and responsive movement. Dual magnets give faster response and with a maximum working tilt angle of 20° ensures accurate compass headings.   A Ratchet Bezel with compass headings in ten degrees increments and 30° degree indicator marks. Bezel has twin heading indicators for alignment of compass course, and a double lined lubber line across the compass face.   A side window with compass degrees allows gun-sight accurate use when precise headings are required. Also check out  the variety of compass we carry visit : https://gs-diving.com/guage-compass/ Also check out Dive Singapore for the variety of gears we carry visit : https://www.divesingapore.sg/product-category/scuba-equipments/