12.—(1) The operator of a harbour craft which is carrying explosives or which is towing a vessel which is carrying explosives shall ensure that—
(a)the master of that harbour craft is competent to perform the duties required of him; and
(b)the master and any other person on duty on the harbour craft are not under the influence of drink or a drug to such an extent that their capacity to carry out their duties is impaired.
(2) The master of any harbour craft referred to in paragraph (1) shall control that craft with due care and diligence.