What is the recommended signal for a vessel engaged in fishing?

The recommended signal for a vessel engaged in fishing is one prolonged blast. This signal serves to indicate the vessel's activity, particularly in situations where sound signals are needed to communicate its presence to nearby vessels. A prolonged blast is used to alert others that the fishing vessel is engaged in specific operations that may affect navigation. Knowing this signal is essential for maintaining safety and preventing collisions, especially in busy waterways where multiple vessels might be operating simultaneously.

The context of this signal within the COLREGs is significant because it informs other vessels of the fishing operation, which often involves limited maneuverability. This awareness is crucial for other mariners who may need to adjust their course or speed accordingly. In contrast, the other options represent different types of sound signals that pertain to other maritime contexts, not specifically to vessels engaged in fishing.