Sound signal for vessel at anchor in fog

• A. Bell every 2 minutes
• B. Bell every minute
• C. Horn blast every 30 seconds
• D. Whistle blast every 5 seconds

Answer: (B)

In fog, vessels use standard sound signals to clearly communicate status to others. For a vessel at anchor, a bell is the recognized signal, and the cadence is once per minute. This regular, noticeable pattern lets nearby boats understand that you’re stationary and not maneuvering, reducing the chance of misinterpretation in poor visibility. The other options mix in sounds that imply moving or different situations (horns or whistles) or use cadences that are too frequent or too infrequent to convey anchored status reliably. Therefore, ringing a bell every minute is the best way to indicate you’re anchored in fog.