46 C.F.R. § 67.325 Violation of endorsement.
Title 46 - Shipping
A vessel may not be employed in any trade other than a trade endorsed upon the Certificate of Documentation issued for that vessel. A vessel documented exclusively for recreation may not be used for purposes other than pleasure.
Title 46: Shipping
PART 67—DOCUMENTATION OF VESSELS
Subpart U—Special Provisions
§ 67.325 Violation of endorsement.