BOTH INTERNATIONAL & INLAND You are on vessel "A" and proceeding down a narrow channel as shown in illustration D040RR below. You can only navigate within the channel and vessel "B" is crossing so as to involve risk of collision. Which action would be most prudent?

Correct Answer: Option D — Sound the danger signal and take evasive action.

Rule 8 and Rule 34 require taking positive action to avoid collision. When a vessel in a narrow channel is being crossed by another, sounding the danger signal (Rule 34(d)) is the mandatory first step to alert the other vessel, followed by immediate evasive maneuvers to prevent a collision.