In a narrow channel, a signal of intent that must be answered by the other vessel is sounded by a vessel that is

• A. Overtaking another
• B. Anchoring
• C. Crossing the channel
• D. Reversing engines

Answer: (B)

In a narrow channel, signaling your intent to anchor is a way to warn others that you are about to stop and set an anchor, which can affect the available space for passage. That signal is made by the vessel that plans to anchor, so the other vessel must take notice and respond with the appropriate action to avoid a collision or obstruction. The purpose of this specific signaling requirement is to ensure mutual awareness in a confined, high-risk area. Other maneuvers listed—overtaking, crossing, reversing—do not involve a formal signal of intent that requires the other vessel to respond in the same way, so they don’t fit this rule.