What must federally documented boats do with their documentation numbers?

Federally documented boats are required to attach their documentation numbers permanently to a structural portion of the hull to ensure that the identification of the vessel is clear and unambiguous. This requirement helps in easily identifying the boat and is crucial for legal, safety, and regulatory reasons. The documentation number is used to provide ownership information and verify the vessel's eligibility for certain benefits and protections under U.S. law.

The placement is typically done on the starboard side of the transom or on the interior of the hull, which makes it difficult to remove or alter, thereby minimizing the risk of fraud or misrepresentation. Proper display of the documentation number is part of compliance with federal regulations and helps in maintaining an accurate registry of boats operating in U.S. waters.