What is the not-underway fog signal for an anchored vessel under 100 meters?

• A. Five seconds of rapid gong ringing every minute
• B. Two short blasts every minute
• C. One long, one short, and one long
• D. Five seconds of rapid ringing bell every one minute

Answer: (D)

In fog, vessels signal their status to others, and a vessel that is not underway and is anchored uses the ship’s bell to communicate that status. The sound should be five seconds long and repeated every minute. Using the bell keeps the signal distinct from other situations that use whistles or gongs, and the one-minute interval is the standard cadence for an anchored vessel under 100 meters.

So, five seconds of rapid ringing on the bell every minute matches the not-underway, anchored condition exactly. The other signals either use a different sound (a gong), a different duration or cadence, or describe a different status, so they don’t fit this scenario.