Attwood Anchor Masthead Boat Navigation Light - Horizontal Mount This Attwood Anchor Masthead Boat Navigation Light features an easy to grasp cam-lock that stays locked in normal conditions. The cam-lock releases in extreme conditions and allows the base to swing down, reducing the chance of breakage to the base or the pole. For use on boats up to 65.6 ft. 20 meters, this boat navigation light features non-corrosion materials that include bases of glass-filled polymer and poles of highly anodize