The master of every vessel within the harbour or dock, or at or near the pier, or within the prescribed limits, if any, shall regulate such vessel according to the directions of the harbour master, made in conformity with this and the special Act; and any master of a vessel who, after notice of any such direction by the harbour master served upon him, shall not forthwith regulate such vessel according to such direction shall be liable to a penalty not exceeding F1level 2 on the standard scale.