A nun buoy is prepared to be put on station. A series of steps take place from placing the buoy in position, dropping the weight and then the buoy. The two major classes of buoys used in the Coast Guard are Ocean Buoys and River Buoys. Ocean buoys consist of unlighted cans, nuns, and spheres, as well as sound buoys and standard lighted buoys. Standard lighted buoys are designated by IALA as pillar buoys. River buoys consist of unlighted cans and nuns with specially designed fins and counterweights. USCG photo by SNYDER, JERRY L. PA1
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