Towing & Ship-Assist · Sound Signals
In restricted visibility, a power-driven vessel engaged in towing sounds, at intervals of not more than two minutes:
- AOne short blast
- BTwo prolonged blasts
- COne prolonged blast followed by two short blasts✓ Correct
- DContinuous sounding of the whistle
Explanation
A vessel engaged in towing (like vessels not under command, restricted in ability to maneuver, fishing, or sailing) sounds one prolonged followed by two short blasts every two minutes in restricted visibility, distinguishing it from a vessel making way (one prolonged).
Authority: Navigation Rules, Rule 35(c)
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