Download LiteratureRitchie Compass B-51W 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 Approx. Shipping Weight: 1lb (454g)Notes:All compasses come standard with 12 volt lighting. 24 volt lighting option is available.Some custom built OEM models may have different lighting. Contact Ritchie for replacement lighting. Specifications:Lubber Lines = NONE Mounting Style = NONE Read = Front Backlight = YesRITCHIE B-51W EXPLORER COMPASS, WHITENormalized SKU: B51WUPC Code: 010342160515Ritchie Compass B-51W Literature Download Quick Reference Guide Owners Manual