Ritchie - Helmsman Compass - Flush Mount - Black - HF-742. Helmsman Compass Features:. 3-3/4" PowerDamp Flat Dial. Easily Installed, Fits 4" (10.16cm) 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. Adapter Rings Available. Sold separately. 6" (15.24). Retrofits Existing Mounting Hole for Model No. HF-72 order H-ABLK. For Model No. HF-72W order H-AWHT. 100% Repairable. Exclusive 5-Year Ritchie Warranty. Approx. Shipping Weight: 2lbs (907g). Notes:. Comes standard with 12V lighting. 24 & 32V lighting options are available. Some custom built OEM models may have different lighting.