Question 34 TV02 - Towing Vessels - Great Lakes and Inland

The Correct Answer is A. A tugboat displaying the shape shown in illustration D010RR (a black diamond shape) is indicating that **it has a tow that exceeds 200 meters in length**. This signal is mandated by both the International Regulations for Preventing Collisions at Sea (COLREGs/72) and Inland Navigation Rules, specifically 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 must exhibit this shape during the daytime. --- **Why the other options are incorrect:** * **B) Has a tow that is carrying hazardous cargo:** While vessels carrying hazardous cargo must often display specific placards or signals (e.g., restricted visibility lights/shapes if required by local regulations or safety codes), the black diamond shape is specifically reserved for indicating the length of the tow, not the nature of the cargo. * **C) Is at anchor:** A vessel at anchor displays a black ball shape (or two balls if over 50 meters in length) during the day, not a black diamond. * **D) Is not under command:** A vessel not under command (NUC) displays two black balls in a vertical line during the day, not a black diamond.