Towing & Ship-Assist · Sound Signals
A manned vessel being towed, if practicable, sounds in restricted visibility:
- ANothing — only the tug signals
- BOne prolonged blast followed by three short blasts, immediately after the towing vessel's signal✓ Correct
- CTwo prolonged blasts
- DA continuous bell
Explanation
Under Rule 35(e), a manned vessel being towed sounds one prolonged followed by three short blasts (where practicable, immediately after the tug's signal) so other vessels know the extent of the tow in fog.
Authority: Navigation Rules, Rule 35(e)
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