Question 47

The Correct Answer is D **Explanation for Option D (Correct):** The required fog signal for a vessel being towed (whether manned or unmanned, under both International and Inland Rules, provided the towing vessel is sounding the required signal) is stipulated in Rule 35(e) of the COLREGs (International Regulations for Preventing Collisions at Sea). Rule 35(e) states that a vessel being towed shall sound at intervals of not more than 2 minutes, **four** distinct blasts in succession: **one prolonged followed by three short blasts** (— • • •). This signal is required to be sounded immediately after the towing vessel sounds its own signal (one prolonged followed by two short blasts). **Explanation for Other Options (Incorrect):** * **A) One prolonged followed by two short blasts:** This is the fog signal required for a **power-driven vessel underway but stopped** (not making way) (Rule 35(b)), or for the **towing vessel itself** when sounding its whistle to indicate it has a tow (Rule 35(c)). It is not the signal for the vessel being towed. * **B) Two prolonged blasts:** This is the signal required for a **vessel not under command**; a vessel **restricted in her ability to maneuver** (when at anchor or underway); a **sailing vessel**; a vessel **engaged in fishing** (at anchor or underway); or a vessel **engaged in towing** (if the tow is pushed ahead or comes alongside and the combined length is 200 meters or more). It is not the signal for a vessel being towed. * **C) One prolonged followed by one short blast:** This signal is used by a vessel that is **pilot vessel** engaged on pilotage duty (Rule 35(h)). It is not the signal for a vessel being towed.