Question 31

The Correct Answer is C A vessel displaying the shape shown in illustration D010RR (a black diamond shape) indicates that the vessel has a tow that exceeds 200 meters in length, according to Rule 24(a)(ii) of the International Regulations for Preventing Collisions at Sea (COLREGs), which applies to both international and inland waters (where the Inland Rules adopt the same provision). This shape is displayed in addition to the masthead lights or steaming lights required for towing vessels. **Why other options are incorrect:** * **A) Is at anchor:** A vessel at anchor displays one or two black ball shapes, depending on its length, not a diamond shape (Rule 30). * **B) Is not under command:** A vessel not under command displays two black ball shapes vertically in a line, not a diamond shape (Rule 27(a)). * **D) Has a tow that is carrying hazardous cargo:** There is no specific daytime shape prescribed in COLREGs solely for a tow carrying hazardous cargo. The diamond shape is explicitly reserved for indicating the length of the tow (exceeding 200 meters).