SuperSport CompassDeveloped for and tested on offshore race boats the SuperSport Series compasses feature the PowerDamp Plus dial. This dial technology features the PowerDamp? dial skirt to prevent oscillation, larger DirectiveForce™ magnets for quick lock on and extra-large steel pivots and jewels for smooth fast action.Features 3-3/4 PowerDamp Plus, High-Visibility Blue Dial with Extra Large White Numerals Easily Installed, Fits 4 10.16 cm Mounting Hole Built-in Compensators to Easily Adjust for Deviation Scientifically Matched Sapphire Jewel Hardened Steel Pivot Dial Movement Internal Gimbal Systems for Maximum Stability During Adverse Pitch and Roll Conditions Powerful DirectiveForce Magnets for Fast Heading Lock-on Exclusive Built-in Green NiteVu Night Illumination in Movable Sun Shields 45 Degree Lubber Lines High Temperature Construction for Extended Operating Range Custom Fitted Protective Covers 100% Repairable Exclusive 5-Year Ritchie Warranty