When is a vessel required to use sound signals?

A vessel is required to use sound signals primarily in conditions of restricted visibility or when it is maneuvering. This requirement is rooted in maritime safety regulations designed to prevent collisions, especially when visibility is compromised—such as in fog, heavy rain, or darkness. Sound signals help communicate the vessel's intentions to others in the area, alerting them of its presence and movements.

Using sound signals in restricted visibility is not merely a recommendation but a crucial practice that enhances situational awareness on the water. Additionally, when a vessel is maneuvering—whether docking, overtaking another vessel, or navigating a narrow channel—sound signals are essential to inform nearby vessels of its actions.

In contrast, sound signals are not mandatory when speeding, nor are they exclusive to nighttime operations. While it is courteous to signal when passing other vessels to ensure mutual awareness and safety, the formal requirement for sound signals stems more from the conditions of visibility and the potential for complex navigational scenarios.