The owner or proprietor of a boat rental or charter operation shall cause to be kept a record of the name and address of the person or persons hiring any watercraft, the identification number of such watercraft, the departure date and the time and the date and the time of the return of such watercraft. Such record shall be preserved for not less than six months after the departure date of such watercraft and shall be kept available for inspection by any duly authorized agency or authority. Prior to departure from the premises of such boat rental or charter operation, any such watercraft shall carry the equipment and numbering as required in BCC 12.04.250. (1961 code § 13.09.392.)