The Prince William Sound Traffic Separation Scheme consists of four parts: Prince William Sound Traffic Separation Scheme, Valdez Arm Traffic Separation Scheme, and two precautionary areas. These parts are described in Secs. 167.1701 through 167.1703. The geographic coordinates in Secs. 167.1701 through 167.1703 are defined using North American Datum 1983 (NAD 83). [USCG-2001-10254, 67 FR 53743, Aug. 19, 2002]