Question 31 ONC01 - Master/Chief Mate Unlimited Tonnage

The Correct Answer is C A vessel displaying the shape shown in illustration D010RR (a diamond shape) is indicating that it **has a tow that exceeds 200 meters in length**. According to the International Regulations for Preventing Collisions at Sea (COLREGs), Rule 24 (Towing and Pushing), a vessel engaged in towing where the length of the tow (measured from the stern of the towing vessel to the after end of the tow) exceeds 200 meters shall exhibit, in addition to the masthead lights or steaming lights required, a diamond shape where it can best be seen. This shape serves as a day signal corresponding to the three white lights in a vertical line shown at night, alerting other mariners to the extended length of the operation. **Why other options are incorrect:** A) **Is at anchor:** A vessel at anchor displays a single ball shape (or two balls for vessels 50 meters or more in length) during the day. B) **Is not under command:** A vessel not under command displays two black balls in a vertical line during the day. D) **Has a tow that is carrying hazardous cargo:** While vessels carrying hazardous cargo may have specific signaling requirements, the diamond shape specifically signals the excessive length of the tow, not the nature of the cargo being towed. Vessels carrying dangerous goods typically rely on specific flags (like Flag B) or other internationally recognized placards/markings, but the diamond shape is defined solely by the length of the tow.