What does the term 'prolonged blast' mean?

The term 'prolonged blast' is defined in the context of maritime signaling, particularly under the International Regulations for Preventing Collisions at Sea (COLREGs). A prolonged blast is specifically described as a sound signal lasting between 4 to 6 seconds. This duration is significant because it differentiates it from shorter blasts, which serve different purposes in navigation and communication between vessels.

A prolonged blast is typically used to signal a vessel’s presence and can indicate that it is maneuvering in a manner that others need to be aware of, such as when navigating through restricted waters or during times of reduced visibility. The recognition of this specific time frame is crucial for ensuring that all vessels understand the intentions and maneuvers of others in the vicinity, thus promoting safety at sea.

Understanding this definition helps in grasping the importance of sound signals in maritime operations and reinforces the need for accurate and clear communication among vessels.