21Special directions to vessels in the port and the Medway approach area
(1)A direction under this section may be given for any of the purposes set out in subsection (2) of this section by the harbour master to a vessel anywhere in the port or the Medway approach area and to a vessel prior to its entering the port from a dock.
(2)A direction under this section may be given for any of the following purposes:—
(a)requiring a vessel to comply with a requirement made in or under a general direction;
(b)regulating or requiring for the ease, convenience or safety of navigation the movement, mooring or unmooring of a vessel;
(c)regulating for the safety of navigation the manner in which a vessel takes in or discharges cargo, fuel, water or ship's stores.