Where a court has jurisdiction within a district which is situated on the coast of a sea, or abutting on or projecting into a bay, channel, lake, river or other navigable water, the court shall have jurisdiction over any vessel being on, or lying or passing off, that coast, or being in or near that bay, channel, lake, river or navigable water and over persons on board that vessel as if the vessel or persons were within the limits of the ordinary jurisdiction of the court.