Question 34

The Correct Answer is A. A tugboat displaying the shape shown in illustration D010RR (a black diamond shape) signifies that the vessel is engaged in a towing operation where the length of the tow measured from the stern of the towing vessel to the after end of the tow exceeds 200 meters. This signal is required under both the International Regulations for Preventing Collisions at Sea (COLREGs Rule 24) and the corresponding Inland Navigation Rules. **Why other options are incorrect:** B) **Has a tow that is carrying hazardous cargo:** There is no specific day signal (shape) designated solely for a vessel with a tow carrying hazardous cargo. The black diamond shape relates only to the length of the tow. C) **Is at anchor:** A vessel at anchor displays a single black ball forward (or two black balls if exceeding 50 meters in length), not a black diamond. D) **Is not under command:** A vessel not under command (NUC) displays two black balls in a vertical line, not a black diamond.