(a) Prohibitions.— Except as provided in subsection (b), an American Great Lakes vessel may not be used to
(1) engage in trade
(A) from a port in the United States that is not located on the Great Lakes; or
(B) between ports in the United States;
(2) transport bulk cargo (as defined in section
40102 of this title) that is subject to section
55305 or
55314 of this title or section
2631 of title
10; or
(3) provide a service (except ocean freight service) as
(A) a contract carrier; or
(B) a common carrier on a fixed advertised schedule offering frequent sailings at regular intervals in the foreign trade of the United States.
