Not Underway fog signals for an anchored vessel less than 100 meters

• A. Five seconds of rapid ringing bell every one minute
• B. Three seconds of rapid ringing bell every two minutes
• C. Five seconds of rapid ringing bell every two minutes
• D. Five seconds of rapid ringing bell forward every minute

Answer: (A)

In fog, vessels reveal their status with sound patterns so others can understand what you’re doing. For a vessel that is not underway and is anchored, the signal is a five-second burst of rapid bell ringing, repeated once every minute. This pattern clearly shows you’re stationary and anchored, and the minute cadence gives other nearby vessels a regular, easy-to-hear reference to judge your position and movement.

The other options don’t fit because they either change the duration of the bell signal, alter the interval between signals, or modify the signal in a way that would imply a different status. The chosen pattern—five seconds of rapid bell ringing each minute—matches the standard for an anchored vessel not underway, especially for vessels under 100 meters in length.