15. (1) The master of every vessel entering or leaving the Port to which the provisions of the Customs Act, 1969 (IV of 1969), in regard to entering or clearing at a Customs House, do not apply shall be bound to stop at one or other of the stations established by Authority for the registration of river-borne traffic, and forthwith to make a full and true declaration of the nature and value of the cargo at the time being carried by him on such vessel. (2) No such master shall withdraw his vessel from any such station until he has received from the officer-in-charge of the same a pass on which the particulars of the nature and value of the cargo so being carried shall be recorded.