Subsection F.

The mortgagor (1) shall, upon request of the mortgagee, disclose in writing to him prior to the execution of any preferred mortgage, the existence of any maritime lien, prior mortgage, or other obligation or liability upon the vessel to be mortgaged, that is known to the mortgagor, and (2), without the consent of the mortgagee, shall not incur, after the execution of such mortgage and before the mortgagee has had a reasonable time in which to record the mortgage and have indorsements in respect thereto made upon the documents of the vessel, any contractual obligation creating a lien upon the vessel other than a lien for wages of stevedores when employed directly by the owner, operator, master, ship's husband, or agent of the vessel, for wages of the crew of the vessel, for general average, or for salvage, including contract salvage, in respect to the vessel.

Subsection G.

(a) The collector of customs of the port of documentation shall, upon the request of any person, record notice of his claim of a lien upon a vessel covered by a preferred mortgage, together with the nature, date of creation, and amount of the lien, and the name and address of the person. Any person who has caused notice of his claim of lien to be so recorded shall, upon a discharge in whole or in part of the indebtedness, forthwith file with the collector of customs a certificate of such discharge. The collector of customs shall thereupon record the certificate.

(b) The mortgagor, upon a discharge in whole or in part of the mortgage indebtedness, shall forthwith file with the collector of customs for the port of documentation of the vessel, a certificate of such discharge. Such collector of customs shall thereupon record the certificate. In case of a vessel covered by a preferred mortgage, the collector of customs at the port of documentation shall (1) indorse upon the documents of the vessel, or direct the collector of customs at any port in which the vessel is found, to so indorse, the fact of such discharge, and (2) shall deny clearance to the vessel until such indorsement is made.

Subsection H.

(a) No bill of sale, conveyance, or mortgage shall be recorded unless it states the interest of the grantor or mortgagor in the vessel, and the interest so sold, conveyed, or mortgaged.

(b) No bill of sale, conveyance, mortgage, notice of claim of lien, or certificate of discharge thereof, shall be recorded unless previously acknowledged before a notary public or other officer authorized by a law of the United States, or of a State, Territory, District, or possession thereof, to take acknowledgment of deeds.

(c) In case of a change in the port of documentation of a vessel of the United States, no bill of sale, conveyance, or mortgage shall be recorded at the new port of documentation unless there is furnished to the collector of customs of such port, together with the copy of the bill of sale, conveyance, or mortgage to be recorded, a certified copy of the record of the vessel at the former port of documentation furnished by the collector of such port. The collector of customs at the new port of documentation is authorized and directed to record such certified copy.