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 Directive-Force Magnets for Fast Heading Lock-on; Movable Sun Shield; High Temperature Composite Construction for Extended Operating Range; 100% Repairable; Exclusive 5-Year Ritchie Warranty. The WM suffix signifies type approval and compliance with the Navigation requirements of Marine Equipment Directive (MED) 95/98/EC and the last modification by Directive 2011/75/EU. Great Product.