What is the role of sound signals in restricted visibility?

• A. To replace radio communications.
• B. To indicate a vessel’s presence and, where appropriate, its intention to maneuver; signals help others anticipate actions in poor visibility.
• C. To amuse the crew.
• D. To signal weather changes.

Answer: (B)

In restricted visibility, sound signals are a key way to communicate when you can’t rely on seeing other vessels. They provide audible notice of your vessel’s presence and, when appropriate, your intended maneuver. Because other ships may not be able to visually detect you, these signals let them anticipate your actions (for example, that you are changing course or reducing speed) and adjust theirs accordingly. This helps coordinate movements and reduce the risk of collision. Sound signals support, not replace, other tools like radar and radio, and are not about weather or entertainment.