Question 34 ONC03 - Master LT 500-1600 GRT

The Correct Answer is A A **tugboat displaying the shape shown in illustration D010RR** (which consists of a black diamond shape) signifies that the vessel is constrained by its tow and that 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 mandated by both the International Regulations for Preventing Collisions at Sea (COLREGs Rule 24) and the Inland Navigational Rules (Rule 24) for vessels engaged in towing where the tow is exceptionally long. **Why other options are incorrect:** * **B) Has a tow that is carrying hazardous cargo:** Vessels carrying hazardous cargo do not display a standard diamond shape signal under COLREGs or Inland Rules. They may display specific flags or lights (such as the B-flag or specific tank vessel lights) depending on local regulations or the nature of the cargo, but not the diamond shape. * **C) Is at anchor:** A vessel at anchor displays one or two black ball shapes, depending on its length (COLREGs Rule 30). * **D) Is not under command:** A vessel not under command (NUC) displays two black ball shapes in a vertical line (COLREGs Rule 27).