If your vessel is engaged in FISHING and anchored or restricted in the ability to maneuver due to work while anchored, shall sound at intervals of not more than 2 minutes 3 blasts in succession which shall consists of 1 PROLONGED blast followed by 2 SHORT blasts.

A vessel towed or if more than one vessel is towed, the LAST vessel of the tow if MANNED, shall at intervals of not more than 2 minutes, sound 4 blasts in succession as 1 PROLONGED blast followed by 3 SHORT blasts.

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Hugh Simpson