Why should sound signals be used in restricted visibility?

Sound signals are essential in restricted visibility to enhance safety on the water. When visibility is impaired due to fog, rain, or other obstructions, vessels are often unable to see one another. In such conditions, using sound signals allows vessels to communicate their presence and intentions, reducing the risk of collisions.

By sounding these signals, vessels can indicate their state of navigation—whether they are underway, at anchor, or maneuvering—thus alerting nearby operators to their movements. This practice significantly contributes to maintaining safe distances and promoting situational awareness among vessels navigating in challenging visibility situations. The emphasis on safety underscores the importance of adhering to the International Regulations for Preventing Collisions at Sea (COLREGs), which are designed to prevent maritime accidents.