(a) Except as provided in paragraph (b) of this section, §§ 151.30 through 151.49 apply to each ship that-

(1) Is operated under the authority of the United States and engages in international voyages;

(2) Is operated under the authority of the United States and is certificated for ocean service;

(3) Is operated under the authority of the United States and is certificated for coastwise service beyond three nautical miles from land;

(4) Is operated under the authority of the United States and operates at any time seaward of the outermost boundary of the territorial sea of the United States as defined in § 2.22 of this chapter; or

(5) Is operated under the authority of a country other than the United States while in the navigable waters of the United States, or while at a port or terminal under the jurisdiction of the United States.

(b) Sections 151.30 through 151.49 do not apply to-

(1) A tank barge whose certificate is endorsed by the Coast Guard for a limited short protected coastwise route if the barge is constructed and certificated primarily for service on an inland route;

(2) A warship, naval auxiliary, or other ship owned or operated by a country when engaged in noncommercial service;

(3) A Canadian or U.S. ship being operated exclusively on the Great Lakes of North America or their connecting and tributary waters;

(4) A Canadian or U.S. ship being operated exclusively on the internal waters of the United States and Canada; or

(5) Any other ship specifically excluded by MARPOL 73/78.