SS-1002 SuperSport Compass Features: 3 3/4" PowerDamp Plus, High-Visibility Blue Dial with Extra Large White Numerals. Easily Installed, Fits 4" (10.16 cm) Mounting Hole. (NOTE: Be sure you print the template actual size). 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. 100% Repairable. Exclusive 5-Year Ritchie Warranty.