New York is the only state that combines an Atlantic demarcation coast with a Great Lakes shore, and the two are reached by different mechanisms. On the ocean side, 33 CFR 80.155 closes the eastern end of Long Island Sound at the Race, 80.160 covers Montauk Point to Atlantic Beach inlet by inlet, and 80.165 draws New York Harbor from East Rockaway Inlet to Sandy Hook Light — so the Sound and the harbour are inland water while a Montauk boat is on the International Rules as soon as it clears the jetties. On the lake side there is no Part 80 line at all: Lakes Ontario and Erie are inland water by definition at 83.03(q), and carry the Great Lakes lights option at 83.23(e). The Hudson is ordinary inland water. Under 46 CFR 11.467(b) a plain inland OUPV does not cover the Great Lakes, so a candidate working both ends of the state needs the wider endorsement.
COLREGS Demarcation Lines covering New York — 33 CFR Part 80
- 33 CFR 80.155Watch Hill, RI to Montauk Point, NYline drawn — Inland water inside
- 33 CFR 80.160Montauk Point, NY to Atlantic Beach, NYline drawn — Inland water inside
- 33 CFR 80.165New York Harborline drawn — Inland water inside
Great Lakes water (Lakes Ontario and Erie) needs no Part 80 line: 33 CFR 83.03(q) defines inland waters to include the waters of the Great Lakes on the United States side of the International Boundary. Under 46 CFR 11.467(b) a plain inland OUPV endorsement covers all inland waters except the Great Lakes.
This decides which rulebook you steer by, not where your credential may operate: the route limit is the 46 CFR Part 7 Boundary Line, and the two lines are not drawn in the same place. How the two lines differ · International Rules · Inland Rules
33 CFR Part 80 and the Part 83 definitions above read from eCFR on 12 Aug 2026. Any specific water is a determination for the cognizant Coast Guard Officer in Charge, Marine Inspection.