BOTH INTERNATIONAL & INLAND While underway in fog, you hear a vessel ahead sound two short blasts on the whistle. You should take which action?

Correct Answer: Option B — Sound only fog signals until the other vessel is sighted

Rule 34(a) maneuvering signals are only for vessels in sight of one another. In restricted visibility, Rule 35 governs. You must continue sounding the appropriate fog signals prescribed by Rule 35 until the other vessel is visually sighted, at which point maneuvering signals may be exchanged under Rule 34.