Unlight Navigational Marker Buoy

A metallic, floatable device of tower construction designed to be anchored in water to mark the location of channels, shoals, rocks, reefs, submerged obstacles, and the like, andto promote safe navigation of watercraft. It accommodates a sound making apparatus, such as a bell, gong, or whistle. It is not designed to accommodate a lantern. See also buoy, navigational marker, lighted.