AIDS TO NAVIGATION - U.S. Coast guard photo

Philadelphia, PA (July 10)--The Heat 'N' Beat aboard the CGC Redwood (WLM 685). Crewmembers reattach a link of buoy chain before putting the 7 X 17 Pillar buoy back on station. 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 photoby SANTOS, DAVID PA1