If necessary to attract the attention of another vessel any vessel may make light or soundsignals that cannot be mistaken for any signal authorised elsewhere in these Rules, or may direct the beam of ...
(Rule 35 (Sound signals in restricted visibility))
In or near an area of restricted visibility, whether by day or night, the signals prescribed in this Rule shall be used as follows:
(a) A power-driven vessel making way through the water shall sound ...
... shall, in addition, be provided with a gong, the tone and sound of which cannot be confused with that of the bell. The whistle, bell and gong shall comply with the specifications in Annex III to these ...
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