Vermont's entire answer turns on one word that Lake Champlain does not qualify for. 33 CFR 83.03(o) defines the Great Lakes as the Great Lakes and their connecting and tributary waters, and then names exactly what it means to include — the Calumet as far as the Thomas J. O'Brien Lock, the Chicago River as far as the Ashland Avenue Bridge, the St. Lawrence as far east as Saint Lambert Lock. Champlain is not on that list and is not tributary to it, so despite its size it is ordinary inland water under 83.03(q): the 83.23(e) lights option does not apply, and neither does the 46 CFR 11.467(b) carve-out that would otherwise put a Champlain operator outside a plain inland OUPV endorsement. That is a favourable answer and it is worth knowing it is the correct one rather than an oversight. No Part 80 line reaches Vermont, and REC Boston handles the file.
33 CFR Part 80 draws no demarcation line in Vermont. Its 106 sections cover the Atlantic, Gulf and Pacific coasts, Puerto Rico and the Virgin Islands, the Pacific islands and Alaska; a state with no coast has no section, which is itself the answer.
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.