5. It shall be the duty of the master to ensure that he, or a person authorised by him, together with a member of the crew employed in catering on the ship, inspects not less than once a week provisions and water for the purpose of checking whether the provisions and water still comply with sub-paragraphs (a) to (c) of regulation 4 above. The results of such inspections shall be recorded in the Official Log Book of the ship.