All cargo vessels, foreign or domestic, carrying passengers from the Virgin Islands to other parts in the West Indies shall be required to obtain from the Collector of Customs in St. Thomas a certificate of inspection according to the provisions of the Act of Congress of June 5, 1920 (46 U.S.C. § 882) as modified by the International Convention for the Safety of Life at Sea, unless an unexpired certificate of inspection is carried which has been obtained in a United States port where such inspections are made and certificates of inspection issued, as provided in such Act of June 5, 1920.