Download LiteratureRitchie Compass B-51 CompassExplorer CompassExplorer Compass Features: 2-3/4" Easy to Read Direct Reading Dial Adjustable and Removable with Bracket and Thumbscrews Internal Green Night Illumination Built-in Compensators to Easily Adjust for Deviation Scientifically Matched Sapphire Jewel & Hardened Steel Pivot Dial Movement Powerful DirectiveForce Magnets for Fast Heading Lock-on Movable Sun Shield High Temperature Composite Construction for Extended Operating Range 100% Repairable Exclusive 5-Year Ritchie Warranty Protective Cover: None Approx. Shipping Weight: 1lb (454g)Notes: Comes standard with 12V lighting. 6 & 24V lighting options are available.Some custom built OEM models may have different lighting. Contact Ritchie for replacement lighting. Specifications:Lubber Lines = NONE Mounting Style = Bracket Read = Front Backlight = YesRITCHIE B-51 EXPLORER COMPASS, BLACKNormalized SKU: B51UPC Code: 010342160102Ritchie Compass B-51 Literature Download Quick Reference Guide Owners Manual