When is a sound signal required according to navigational rules?

A sound signal is required when meeting or crossing inland waters to communicate intentions and ensure safety. This is especially important in scenarios where visibility may be limited or when vessels are navigating narrow channels or congested areas. Sound signals help to prevent collisions by alerting other vessels about your presence and your maneuvers.

In inland waterways, the risk of collision may be higher due to various factors such as the proximity of the vessels, turns in the waterway, and possible obstacles in the navigation path. Therefore, adhering to sound signaling rules in these scenarios is crucial for safe navigation.

While sound signals may also be relevant in other situations, such as overtaking or when navigating international waters, the specific need for signaling in inland waters is rooted in the increased navigation challenges present in those areas. The requirement for sound signals when anchored is generally not mandated unless the vessel is operating in a specific traffic situation or as per local regulations.