Rule 36
Signals to attract attention.
If necessary to
attract the attention of another vessel any vessel may make light or sound
signals that cannot be mistaken for any signal authorised elsewhere in
these Rules, or may direct the beam of her searchlight in the direction
of the danger, in such a way as not to embarrass any vessel. Any light
to attract the attention of another vessel shall be such that it cannot
be mistaken for any aid to navigation. For the purpose of this Rule the
use of high intensity intermittent or revolving lights, such as strobe
lights, shall be avoided.
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