Question 31

The Correct Answer is C **Explanation for Option C (Correct):** The illustration D010RR depicts the dayshape signal for a vessel engaged in towing where the length of the tow, measured from the stern of the towing vessel to the aftermost part of the tow, **exceeds 200 meters**. The required dayshape for this condition is a **diamond shape** (or 'lozenge' shape). This signal is mandated by Rule 24(a)(i) of the International Regulations for Preventing Collisions at Sea (COLREGs) and applies universally (both internationally and inland). **Explanation of Incorrect Options:** **A) Is at anchor:** A vessel at anchor (if less than 50 meters in length) displays a single **black ball**. If 50 meters or more, it displays two black balls, one forward and one aft. A diamond shape is not the correct signal for anchoring. **B) Is not under command:** A vessel not under command (NUC) displays two **black balls** in a vertical line where they can best be seen. A diamond shape is not the correct signal for being not under command. **D) Has a tow that is carrying hazardous cargo:** There is no specific standard dayshape designated by COLREGs solely for a vessel with a tow carrying hazardous cargo. Vessels carrying dangerous goods may be required to display specific flag signals (e.g., Flag B or "Bravo") but not a black diamond dayshape. The diamond shape specifically relates to the length of the tow.