Which of the following is NOT among the four vessels that may not impede passage in a narrow channel?

• A. Sailing
• B. Fishing
• C. Trawling
• D. Crossing

Answer: (C)

In a narrow channel, some vessels are considered able to navigate without blocking the passage for others, while others aren’t given that same allowance because their operation can significantly affect the safety of crossing traffic. The rule here highlights which types of vessels are treated as not impeding the progress of vessels that can safely go through a narrow channel.

Sailing vessels and fishing vessels are typically recognized as just moving through the channel without forcing other traffic to stop or alter course, provided they can do so safely. A crossing vessel context also fits into this idea because it’s about how traffic from different directions interacts in a constrained space, with each party acting to avoid impeding the other.

Trawling, on the other hand, involves gear that extends well out from the vessel and can hinder passage more readily. Because of that gear and the way a trawler operates, it isn’t categorized as one of the vessels that may not impede passage in a narrow channel. That’s why trawling is the choice that is NOT among the four vessels that may not impede passage.