1. A motorboat which has been awarded a number pursuant to federal law or a federally approved numbering system of another state if the boat has been within the Commonwealth for less than ninety consecutive days.

2. A motorboat from a country other than the United States temporarily using the waters of the Commonwealth.

3. A motorboat which is used in a governmental function by the United States, a state or a subdivision of the state.

4. A ship’s lifeboat.

5. A vessel which has a valid marine document issued by the Bureau of Customs of the United States government or any federal agency successor thereto.

6. A racing boat used during an authorized race and during a twenty-four-hour period before and after the race.

7. A motorboat belonging to a class of vessels which has been exempted from numbering by a regulation adopted by the Board after the Board has found that applicable federal law or federal regulation has exempted, or permitted the exemption of, such class of vessels.

8. A motorboat for which (i) a valid temporary registration certificate has been issued by the Department or an authorized agent of the Department, and (ii) an application has been made for a permanent registration and title (if applicable).