BOTH INTERNATIONAL & INLAND A vessel engaged in fishing while at anchor shall sound which fog signal?

Correct Answer: Option B — One prolonged and two short blasts at two minute intervals

Rule 35(c) mandates that a vessel engaged in fishing, whether underway or at anchor, shall sound one prolonged blast followed by two short blasts at intervals of not more than two minutes. This signal alerts other vessels to the presence of fishing gear or restricted maneuverability in restricted visibility.