Rules of the Road · Restricted Visibility Signals
You hear one prolonged blast followed by three short blasts in fog. What type of vessel is most likely producing this signal?
- AA vessel at anchor
- BA vessel being towed, or the last vessel in a tow if manned✓ Correct
- CA pilot vessel on duty
- DA power-driven vessel making way
Explanation
Rule 35(d) assigns one prolonged blast followed by three short blasts to the vessel being towed, or if more than one vessel is being towed, the last vessel in the tow if manned. This allows other vessels to determine the length of the tow ahead. It is sounded after the towing vessel's signal if practicable.
Authority: 72 COLREGS Rule 35(d)
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