(1) Already covered by a number in full force and effect which has been awarded to it pursuant to federal law or a federally approved numbering system of another state, territory or possession of the United States. Provided, that such boat shall not have been within the Virgin Islands for a period in excess of 60 days.
(2) A vessel from a country other than the United States provided the vessel has not been on the waters of the Territory for a period in excess of 60 days;
(3) A motorboat whose owner is the United States, a state or a subdivision thereof.
(4) A ship's lifeboat if the boat is used solely for lifesaving purposes. This exemption does not include craft carried aboard a vessel and used for other than lifesaving purposes;
(5) A motorboat belonging to a class of boats which has been exempted from numbering by the Commissioner after he has found that the numbering of motorboats of such class will not materially aid in their identification; and, if an agency of the Federal government has a numbering system applicable to the class of motorboats to which the motorboat in question belongs, after the Commissioner has further found that the motorboat would also be exempt from numbering if it were subject to the Federal law.
(6) A vessel which has a valid marine document issued by the United States Coast Guard or any Federal agency successor thereto. Such vessel shall register with the Department in accordance with the requirements of section 292 of this title.