Not Underway fog signals for an anchored vessel equal to or greater than 100 meters

• A. Five seconds of rapid bell ringing every minute
• B. Five seconds of rapid bell ringing forward followed by five seconds of rapid ringing of gong aft every one minute
• C. Two short blasts every minute
• D. One prolonged blast every two minutes

Answer: (B)

When visibility is poor and a vessel is not underway at anchor, signals are used to show status and location. For a vessel 100 meters or longer, the required pattern is five seconds of rapid bell ringing at the bow, followed by five seconds of rapid ringing on the gong at the stern, and this sequence is repeated every minute. The bow bell helps others hear the vessel’s forward end, while the stern gong signals the rear, together clearly indicating an anchored ship and its orientation. The other patterns don’t meet the rule: they either omit the gong or the bell, use the wrong interval, or describe signals for different situations.