Question 31 OSV01 - Master/Chief Mate - Offshore Supply Vessels

The Correct Answer is C **Explanation for Option C (Correct):** The illustration D010RR depicts a vessel displaying two black diamond shapes, one above the other. According to both the International Regulations for Preventing Collisions at Sea (COLREGs, Rule 24) and the Inland Rules, 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 is required to display a black diamond shape where it can best be seen. Therefore, a vessel displaying the shape shown is indicating that **it has a tow that exceeds 200 meters in length**. **Explanation for Other Options (Incorrect):** * **A) Is at anchor:** A vessel at anchor displays a black ball shape (or two black balls for vessels 50 meters or more in length). It does not display a diamond shape. * **B) Is not under command:** A vessel not under command displays two black balls, one vertical line. It does not display a diamond shape. * **D) Has a tow that is carrying hazardous cargo:** There is no specific day signal (shape) required by COLREGs or Inland Rules solely to indicate that a vessel's tow is carrying hazardous cargo. The diamond shape indicates the length of the tow, not the nature of the cargo being towed. (Note: Vessels carrying dangerous cargo may display a specific light/signal in certain situations or jurisdictions, but the diamond shape does not indicate this.)