22.36 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 other signal authorised elsewhere in this section. It may direct the beam of its searchlight in the direction of the danger in such a way as to not embarrass any vessel.

Any light to attract the attention of another vessel must be such that it cannot be mistaken for any aid to navigation, and high intensity intermittent or revoling lights, such as strobe lights, must be avoided.