FAQ: Does a Documented Boat Need to Be Registered in Maine?

No, US Coast Guard Documented vessels are exempt from watercraft registration in the State of Maine.

1. All motorboats of any size, including airmobiles and personal watercraft, must be registered in Maine to be used on the waters of this State, except the following:
2. Watercraft required to have a valid marine document as a watercraft of the United States. Vessels over 5 net ton used for commercial fishing must be documented.
3. Watercraft with valid registration from another state, provided the watercraft registration number is displayed on the motorboat and the motorboat will not be in Maine over 60 consecutive days after the state of principal use has been changed;
4. Military or public watercraft, except recreational type watercraft of the United States;
5. A motorboat owned by the United States, a state, or subdivision thereof, which is used for governmental purposes and clearly identifiable as such;
6. A ship’s lifeboat;
7. Motorboats from another country which are not within Maine over 60 consecutive days; and
8. Motorboats used exclusively for racing purposes and displaying a valid boat number issued by a recognized racing association.

https://www.maine.gov/ifw/fishing-boating/boating/index.html