B-81-WM Compass Features:o 3? (72 mm) CombiDamp Dialo Adjustable and Removable with Bracket and Thumbscrewso Exclusive Built-in Green NiteVu Night Illuminationo Scientifically Matched Sapphire Jewel and Hardened Steel Pivot Dial Movemento Powerful DirectiveForce Magnets for Fast Heading Lock-ono Movable Sun Shieldo High Temperature Composite Construction for Extended Operating Rangeo Custom Fitted Protective Covers Availableo 100% Repairableo Exclusive 5-Year Ritchie Warranty