What is the primary purpose of sound signals between vessels?

The primary purpose of sound signals between vessels is to communicate intentions and maneuvers. This is essential for safe navigation, especially in situations where visibility is limited or during maneuvers in close proximity to other vessels. Sound signals serve as a way for vessels to inform each other of their actions, such as if a vessel is altering its course, which allows for better situational awareness and helps prevent collisions.

For instance, when one vessel is overtaking another, specific sound signals are used to indicate the overtaking intention. Similarly, if a vessel is approaching an intersection where navigational rules dictate a right-of-way, sound signals help communicate who has the right of way and what the intentions of the vessels involved are.

While other sound signals exist for purposes like signaling distress or instructing vessels to stop, the comprehensive communication of intentions and maneuvers remains the most crucial aspect of sound signaling under the Rules of the Road.