(a) Notwithstanding anything contained in the
Rules of part B, sections I and II, any vessel overtaking any other
shall keep out of the way of the vessel being overtaken.
(b) A vessel shall be deemed to be overtaking
when coming up with another vessel from a direction more than 22.5
degrees abaft her beam, that is, in such a position with reference
to the vessel she is overtaking, that at night she would be able to
see only the sternlight of that vessel but neither of her sidelights.
(c) When a vessel is in any doubt as to whether
she is overtaking another, she shall assume that this is the case
and act accordingly.
(d) Any subsequent alteration of the bearing between
the two vessels shall not make the overtaking vessel a crossing vessel
within the meaning of these Rules or relieve her of the duty of keeping
clear of the overtaken vessel until she is finally past and clear.