Question 47

The Correct Answer is D. ### Explanation for D (Correct Answer) The required fog signal for a **manned vessel being towed** (either international or inland waters, as the rules are identical for this specific signal) is governed by Rule 35(e) of the International Regulations for Preventing Collisions at Sea (COLREGs). * **Rule 35(e) states:** "A vessel being towed, or, if more than one is towed, the last vessel of the tow, if manned, shall at intervals of not more than 2 minutes exhibit four blasts in succession, namely **one prolonged followed by three short blasts**." This distinctive signal informs nearby vessels that the sound originates from a tow, alerting them to the presence of a vessel that is restricted in its ability to maneuver and is attached to a towing vessel. ### Explanation for Incorrect Options **A) One prolonged followed by two short blasts:** This signal is the required fog signal for a vessel **not under command**, a **vessel restricted in her ability to maneuver** (excluding a vessel engaged in mine clearance), a **vessel constrained by her draught** (if operating in international waters), a **sailing vessel**, a **fishing vessel** (including trawling), or a vessel engaged in **towing or pushing** (specifically the towing vessel). It is not the signal for the manned vessel being towed. **B) Two prolonged blasts:** This is the required signal for a vessel **at anchor** (in addition to ringing a bell) to give warning of her position and the possibility of collision to an approaching vessel in the fog (Rule 35(g)). **C) One prolonged followed by one short blast:** This is the required signal for a vessel engaged in **mine clearance operations** (Rule 35(f)).