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What sound signal should be made by a pilot vessel engaged on pilotage duty and at anchor?

A pilot vessel at anchor shall at an interval not more than one minute ring the bell rapidly for 5 seconds.
In a vessel, 100m or more in length – bell shall be sounded in the forepart of the vessel and immediately after the ringing of the bell, The gong shall be sounded rapidly for 5 seconds in the after part of the vessel.