BOTH INTERNATIONAL & INLAND Which vessel sounds the same fog signal when underway or at anchor?

Correct Answer: Option B — A vessel restricted in her ability to maneuver

Rule 35(c) requires a vessel restricted in her ability to maneuver, whether underway or at anchor, to sound one prolonged followed by two short blasts. This specific signal alerts other mariners to the vessel's limited capability to deviate from her course or maneuver to avoid collision in restricted visibility.