Vessels of war and public vessels employed for the conveyance of letters and dispatches and not permitted by the laws of the nations to which they belong to be employed in the transportation of passengers or merchandise in trade.

Passenger vessels making three trips or oftener a week between a port of the United States and a foreign port, or vessels used exclusively as ferryboats, carrying passengers, baggage, or merchandise: Provided, That the master of any such vessel shall be required to report such baggage and merchandise to the appropriate customs officer within twenty-four hours after arrival.

Vessels arriving in distress or for the purpose of taking on bunker coal, bunker oil, sea stores, or ship’s stores and which shall depart within twenty-four hours after arrival without having landed or taken on board any passengers, or any merchandise other than bunker coal, bunker oil, sea stores, or ship’s stores: Provided, That the master, owner, or agent of such vessel shall report under oath to the appropriate customs officer the hour and date of arrival and departure and the quantity of bunker coal, bunker oil, sea stores, or ship’s stores taken on board.

Any vessel required to anchor at the Belle Isle Anchorage in the waters of the Detroit River in the State of Michigan, for the purposes of awaiting the availability of cargo or berthing space or for the purpose of taking on a pilot or awaiting pilot services, or at the direction of the Coast Guard, prior to proceeding to the Port of Toledo, Ohio, where the vessel makes entry under section 1434 of this title or obtains clearance under section 60105 of title 46.