((a)) ** .—** A documented vessel may not be titled by a State or required to display numbers under chapter 123 of this title, and any certificate of title issued by a State for a documented vessel shall be surrendered as provided by regulations prescribed by the Secretary.
((b)) ** .—** The Secretary may approve the surrender under subsection (a) of a certificate of title for a vessel covered by a preferred mortgage under only if the mortgagee consents.