Ritchie B-81-WM Voyager Bracket Mount Compass – Wheelmark Approved f/Lifeboat & Rescue Boat Use. The Wheelmark approval is for Lifeboat and Rescue boat compasses. These compasses are also suitable for sailboats, power boats and motor sailing vessels., Features: Wheelmark Certification, 3″ CombiDamp Dial, 12V Green LED Lighting, Adjustable and Removable with Bracket and Thumbscrews, Built-in Compensators to Easily Adjust for Deviation, Scientifically Matched Sapphire Jewel and Hardened Steel Pivot Dial Movement, Powerful DirectiveForce Magnets for Fast Heading Lock-on, Movable Sun Shield, High Temperature Composite Construction for Extended Operating Range, 100% Repairable,