Explorer D-55 Compass: 2 3/4" Easy to Read Direct Reading Dial, Compact Design, Quick Push-Button Removal of Compass Binnacle for Storage and Security, 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, Approx. Shipping Weight: 1 lb (454g). Standard with 12 volt lighting. Diameter 100mm x h103.5.