13.—(1) After the completion of a tidal work A.B. Ports shall at the outer extremity thereof exhibit every night from sunset to sunrise such lights, if any, and take such other steps for the prevention of danger to navigation as the Commissioners of Northern Lighthouses shall from time to time direct.
(2) If A.B. Ports fails to comply in any respect with a direction given under this article, it shall be guilty of an offence and liable on summary conviction to a fine not exceeding the statutory maximum and on conviction on indictment to a fine; but it shall be a defence for A.B. Ports to prove that all due diligence was used to secure compliance with the direction.