33 C.F.R. § 173.29

A person whose name appears as the owner of a vessel on a certificate of number shall, within 15 days, notify the issuing authority in a manner prescribed by the issuing authority of:

(a) Any change in his or her address;

(b) The theft or recovery of the vessel;

(c) The loss or destruction of a valid certificate of number;

(d) The transfer of all or part of his or her interest in the vessel; and

(e) The destruction or abandonment of the vessel.