Page 143 - Collision Avoidance Rules Guide

Section III - Conduct of Vessels in
Restricted Vis i b i 1 it y

RULE 19
Conduct of Vessels in Restricted Visibility

(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 visibil-
ity. A power-driven vessel shall have her engines ready for
immediate manaeuvre.

(c) Every vessel shall have due regard to the prevailing circum-
stances 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.

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