Photo: Aids to Navigation, Delaware River
The crew of the Philadelphia Aids to Navigation Team raises a buoy in the Schuylkill River near Philadelphia Friday, Dec. 5, 2008. The Aids to Navigation Team maintains 44 buoys and 190 fixed aids for the safe passage of mariners in the Delaware River. (U.S. Coast Guard photo/Petty Officer 3rd Class Crystalynn A. Kneen)