BOTH INTERNATIONAL & INLAND A vessel anchored in fog may warn an approaching vessel by sounding which signal?

Correct Answer: Option C — One short, one prolonged, and one short blast of the whistle

Rule 35(h) permits an anchored vessel to sound an additional warning signal to alert an approaching vessel of her position and the possibility of collision. This specific signal—one short, one prolonged, and one short blast—serves as a clear, distinct acoustic warning to prevent an imminent close-quarters situation.