Helmsman CompassHelmsman Compass Features: 3-3/4" PowerDamp Flat Dial Easily Installed, Fits 4" (10.16cm) Mounting Hole. (NOTE: Be sure you print the template Actual size) 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.For all Helmsman built before 1992 please see the service manual page 5-14 or contact Ritchie for replacement lighting. Specifications: Backlight: Yes Lubber Lines: Yes Mounting Style: Flush Read: Front Box Dimensions: 7"H x 8"W x 8"L WT: 2.1 lbs UPC: 010342138262 Quick Guide (pdf)Owner's Manual (pdf)