Voyager Compass Features: 3" CombiDamp Dial. Adjustable and Removable with Bracket and Thumbscrews. Exclusive Built-in Green NiteVu Night Illumination. 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. Custom Fitted Protective Covers Available.