(a) This Rule applies to vessels not in sight
of one another when navigating in or near an area of restricted visibility.
(b) Every vessel shall proceed at a safe speed
adapted to the prevailing circumstances and conditions of restricted
visibility. A power-driven vessel shall have her engines ready for
immediate manoeuvre.
(c) Every vessel shall have due regard to the
prevailing circumstances and conditions of restricted visibility when
complying with the Rules of section I of this part.
(d) A vessel which detects by radar alone the
presence of another vessel shall determine if a close-quarters situation
is developing and/or risk of collision exists. If so, she shall take
avoiding action in ample time, provided that when such action consists
of an alteration of course, so far as possible the following shall
be avoided:
-
(i) an alteration of course to port for a vessel
forward of the beam, other than for a vessel being overtaken;
-
(ii) an alteration of course towards a vessel
abeam or abaft the beam.
(e) Except where it has been determined that a
risk of collision does not exist, every vessel which hears apparently
forward of her beam the fog signal of another vessel, or which cannot
avoid a close-quarters situation with another vessel forward of her
beam, shall reduce her speed to the minimum at which she can be kept
on her course. She shall if necessary take all her way off and in
any event navigate with extreme caution until danger of collision
is over.