Voyager Compass Features 3 PowerDamp Flat Dial Easily Installed, Fits 4 18 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 Repaira