BOTH INTERNATIONAL & INLAND In fog, you hear apparently forward of your beam a fog signal of two prolonged blasts in succession every two minutes. What does this signal indicate?

Correct Answer: Option C — A power-driven vessel underway but stopped and making no way through the water

Rule 35(b) states that a power-driven vessel underway but stopped and making no way through the water shall sound two prolonged blasts in succession with an interval of about two seconds between them, at intervals of not more than two minutes, to indicate her status to other vessels.