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 Short Blast - About 1 second in duration.
 Prolonged Blast - 4-6 seconds duration.
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Sound Signals given in Clear Visibility
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I am altering course to starboard.
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I am altering course to port.
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I am operating astern propulsion.
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or more, I fail to understand your intentions or actions / I doubt if you are taking sufficient action to avoid collision.
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I intend to overtake you on your starboard side.
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I intend to overtake you on your port side.
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I understand your overtaking intentions.
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Vessel approaching bend in channel, and reply.
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Sound Signals given in Restricted Visibility
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Power driven vessel making way, sounded at intervals of not more than two minutes.
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Power driven vessel not making way, sounded at intervals of not more than two minutes.
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A vessel not under command, a vessel restricted in ability to manoeuvre, a vessel constrained by draft, a sailing vessel, a vessel engaged in fishing, or a vessel towing or pulling.
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A manned vessel being towed, or the last vessel of the tow, at intervals of not more than two minutes, immediately after the signal made by the towing vessel.
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5 Sec 5 Sec
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A vessel at anchor shall at intervals of not more that one minute ring a bell rapidly for about five seconds. In a vessel of 100m or more in length the bell shall be sounded in the forepart of the vessel and immediately after the ringing of the bell, a gong shall be sounded for about five seconds in the after part of the vessel.
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In addition to the above a vessel at anchor may sound one short, one prolonged and one short blast in succession to give warning of her position to an approaching vessel.
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3 Times 5 Sec 3 Times
5 Sec
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A vessel aground shall in addition to the bell and gong signal, give three distinctive strokes on the bell immediately before and after the rapid ringing of the bell.
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A vessel less than 12m in length is not obliged to give the signals mentioned above, but if she does not, shall make some other sufficient sound signal at intervals of not more than two minutes.
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