A boat which has a valid marine document issued by the United States Coast Guard or any federal agency which succeeds to the duty of issuing marine documents.
(b)
Foreign boats operated only temporarily in the waters of this state.
(c)
A boat owned and operated by the United States or a state or by an entity or political subdivision of the United States or a state, except recreational type public vessels.
(d)
A ship’s lifeboat used solely for lifesaving purposes.
A boat already covered by a number in full force and effect which has been issued to it pursuant to federal laws or a federally approved numbering system of another state; provided that such boat shall not have been within this state for a period in excess of 60 consecutive days.