46 CFR §42.03-15

1. (a)The term “Great Lakes of North America” means those waters of North America which are defined in § 42.05-40, and in the exception in Article 5(2)(a) of the 1966 Convention.
2. (b)The expressions in the regulations in this part, such as “voyages by sea,” “proceed to sea,” “arrive from the high seas,” etc., shall be construed as having no application to voyages on the Great Lakes or portions thereof unless specifically provided otherwise in part 45 of this subchapter.