Explorer Compass Explorer Compass Features: 2-3/4" Easy to Read Direct Reading Dial Viewing is adjustable to 30 Degrees 12V Night Illumination Built-in Compensators to Easily Adjust for Deviation Easily Installed, Fits 3" (7.62cm) Mounting Hole Scientifically Matched Sapphire Jewel & Hardened Steel Pivot Dial Movement Powerful DirectiveForce Magnets for Fast Heading Lock-on High Temperature Composite Construction for Extended Operating Range 100% Repairable Exclusive 5-Year Ritchie WarrantyNotes:Comes standard with 12V lighting. 24V lighting option is available.Some custom built OEM models may have different lighting. Contact Ritchie for replacement lighting.