22.13 Overtaking
Maritime Rules Part 22: Collision Prevention
(1) Despite anything contained in subsections 1 and 2 of section 1 of this Part, any vessel overtaking any other must keep out of the way of the vessel being overtaken.
(2) A vessel will be considered to be overtaking when coming up to another vessel from a direction of more than 22.5 degrees abaft its beam, that is, in such a position where at night the sternlight, but neither of the sidelights of the vessel being overtaken, would be visible.
(3) When a vessel is in any doubt as to whether it is overtaking another, it must assume that it is and act accordingly.
(4) Any subsequent alteration of bearing between the two vessels—
(a) does not make the overtaking vessel a crossing vessel within the meaning of this Part; and
(b) does not relieve the overtaking vessel of its duty to keep clear of the overtaken vessel until it is finally past and clear.