Which vessels are exempt from the requirement to sound fog signals every two minutes?

Which vessels are exempt from the requirement to sound fog signals every two minutes?

• A. Vessels anchored or aground
• B. Vessels not under command
• C. Sailing vessels underway
• D. Vessels engaged in fishing

Answer: (A)

In restricted visibility, vessels that are under way must regularly signal their presence with fog signals, at intervals not more than two minutes, to help others gauge their approach and avoid collisions. Vessels that are anchored or aground are exempt because they are not moving and do not present the same dynamic collision risk as a vessel underway. The other types listed are not exempt; if they are underway in restricted visibility, they still follow the fog signal requirements to aid navigation and collision avoidance.

In restricted visibility, vessels that are under way must regularly signal their presence with fog signals, at intervals not more than two minutes, to help others gauge their approach and avoid collisions. Vessels that are anchored or aground are exempt because they are not moving and do not present the same dynamic collision risk as a vessel underway. The other types listed are not exempt; if they are underway in restricted visibility, they still follow the fog signal requirements to aid navigation and collision avoidance.