Captain’s License Part 56
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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