D.C. Mun. Regs. tit. 19, § 1003
1003.1 If the ownership of a registered vessel changes, a new application form, accompanied by the appropriate registration fee, shall be filed with the Harbor Master by the new owner(s), and a new Certificate of Number and Registration shall be issued to the applicant.
1003.2 The identification number assigned to the vessel may be identical to the identification number previously assigned.
1003.3 A person whose name appears as the owner of a vessel on a Certificate of Number shall notify the Harbor Master in writing within fifteen (15) days of the occurrence of any of the following events:
(a) Any change in the person's name or 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 the person's interest in the vessel, other than the creation of a security interest in the District of Columbia;
(e) The destruction or abandonment of the vessel; or
(f) The documentation of the vessel.
SOURCE: Article 29 § 4(a)(3)(c) and 4(c) of the Police Regulations of the District of Columbia (January 1983).