INTERNATIONAL ONLY Your vessel is crossing a narrow channel. A vessel to port is within the channel and crossing your course. She is showing a black cylinder. What is your responsibility?

Correct Answer: Option C — Do not cross the channel if you might impede the other vessel.

Rule 9(b) states that a vessel of less than 20 meters in length or a sailing vessel shall not impede the passage of a vessel which can safely navigate only within a narrow channel or fairway. The black cylinder indicates a vessel constrained by her draft, requiring your compliance.