Great Lakes
Great Lakes means a route on the waters of any of the Great Lakes, except that for the purposes of parts 178 and 179 of this subchapter, Great Lakes means both the waters of the Great Lakes and of the St. Lawrence River as far east as a straight line drawn from Cap de Rosiers to West Point, Anticosti Island, and west of a line along the 63rd meridian from Anticosti Island to the north shore of the St. Lawrence River.
Source
46 CFR § 175.400
Scoping language
The following terms are used in this subchapter: