Ritchie Navigator Compass - Flush Mount - Black. 75" mounting hole. Ritchie crafted these Compasses with exclusive features including a powerful NiteVu night illumination system and green NiteVu illumination technology. The Ritchie Navigator 12V Compass runs on 12-volts and is 100 percent repairable. If you need a specific model of Ritchie compass there are specific models you need to install. Before you buy that specific model of Ritchie Navigator make sure you have the service manual. Once you find the proper fit the service manual will provide instructions on how to install it. Also make sure you keep the packaging and the original packaging with you to claim your 5-year Ritchie warranty. Specifications for Ritchie FN-201 Navigator Compass: Manufacturer: Ritchie Color: Black Features of Ritchie FN-201 Navigator Compass 4-1/2" PowerDamp Flat Card Dial with Large Numerals Easily Installed Fits 4.75" (12.07 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 Construction for Extended Operating Range Custom Fitted Protective Covers Available 100percent Repairable Exclusive 5-Year Ritchie Warranty Approx. Shipping Weight: 2 lbs 10oz (1.19kg) Comes standard with 12V lighting. 24 & 32V lighting options are available. Some custom built OEM models may have different lighting. For Navigators built before 1986 please see the service manual page 6- 12 or contact Ritchie for replacement lighting. Package Contents: Ritchie FN-201 Navigator Compass Ritchie FN-201: FN-201 Navigator Compass - Flush Mount - Black