Question 34

The Correct Answer is A A tugboat displaying the shape shown in illustration D010RR – which depicts a diamond shape (or a black diamond shape) – is communicating information relevant to Rule 24 (Towing and Pushing). **Why option A ("Has a tow that exceeds 200 meters in length") is correct:** Rule 24(a)(ii) of both the International Regulations for Preventing Collisions at Sea (COLREGs) and Inland Rules states that a vessel engaged in towing or pushing, 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 (among other lights) "a diamond shape at the place where it can best be seen." Therefore, a tugboat displaying this shape is indicating that its tow exceeds 200 meters in length. **Why the other options are incorrect:** * **B) Has a tow that is carrying hazardous cargo:** There is no specific requirement in COLREGs or Inland Rules to display a black diamond shape solely because the tow is carrying hazardous cargo. The display of lights and shapes relates primarily to the operational status (towing, dredging, anchoring, etc.) and size/length of the vessels/tow. * **C) Is at anchor:** A vessel at anchor displays specific day shapes: a black ball at the forward part. If a vessel over 50 meters is at anchor, a second black ball may be displayed near the stern. The diamond shape is never used to signify being at anchor. * **D) Is not under command:** A vessel not under command (NUC) displays two black balls in a vertical line where they can best be seen. The diamond shape is never used to signify that a vessel is not under command.