Ritchie Navigator B-51w .White FO-3497

Explorer with bracket MountExplorer Compass Features> 2 ¾´´ Easy to Read Direct Reading Dial> Adjustable and Removable with Bracket and Thumbscrews> Internal 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(Zone 1)All Magnetic Compasses are vulnerable to magnetic interference, which will produce errors, called deviation. It is the Owner/Operator and/or Helmsman´s responsibility to make sure the compass is properly installed and compensated. Compensation is the act of correcting for deviation. Magnets (speakers, microphones etc.), ferrous metals (steel, iron, etc.) and current carrying devices are common causes of deviation. It is important to understand that magnetic compasses point toward Magnetic North. There is a difference between Magnetic North and True North, and that difference is called variation. Variation differs depending on your geographical location and can be determined by referring to a local chart.PRODUCT NUMBER: FO-3497