Which vessels are required to display sound signals in conditions of reduced visibility?

The correct response indicates that all vessels, regardless of size, must display sound signals when navigating in conditions of reduced visibility. The regulations established by the United States Coast Guard and international maritime conventions aim to enhance safety and communication among vessels operating under such conditions. These sound signals serve to alert other vessels to a ship's presence and intentions, helping to prevent collisions.

Reduced visibility can result from fog, heavy rain, or other weather conditions, making it difficult for vessels to see each other. To mitigate risks, the rules specify that all vessels—commercial, recreational, and sailing alike—are obligated to use sound signals to indicate their movements, such as when they are at anchor or under way. This requirement emphasizes the shared responsibility of all mariners to maintain safe navigation practices, regardless of the type of vessel they operate.