BN-202 Navigator Compass Features:• 4-1/2" Ritchie CombiDial and Built-in Clinometer• Internal Gimbal Systems for Maximum Stability During Adverse Pitch and Roll Conditions• Scientifically Matched Sapphire Jewel and Hardened Steel Pivot Dial Movement• Built-in Compensators to Easily Adjust for Deviation• 45° Lubber Lines• Exclusive Built-in Dual 12V NiteVu Lighting• Fiberglass Reinforced Bowl• Easily Installed, Fits 5.75" Mounting Hole• 100% Repairable• 5-Year Warranty Fiberglass reinforced bowl Easily installed 100% repairable | Ritchie BN-202 Navigator Compass