Voyager Compass Features 3" PowerDamp Flat Dial; Easily Installed, Fits 4 1/8" (10.48 cm) Mounting Hole; 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; 45 Degree Lubber Lines; High Temperature Composite Construction for Extended Operating Range; Custom Fitted Protective Covers Available; 100% Repairable; Exclusive 5-Year Ritchie Warranty;