Vessels adrift
21.—(1) The owner or master of a vessel adrift in the harbour shall be guilty of an offence and liable on summary conviction to a fine not exceeding level 2 on the standard scale.
(2) It shall be a defence for the owner or master of a vessel charged with an offence under paragraph (1) to prove that the vessel did not become adrift as the result of any neglect or default on his part.