What type of signal is typically displayed by a fishing vessel when engaged in fishing?

When a fishing vessel is engaged in fishing, it is required to display two green lights, positioned vertically, at the highest point of the vessel. This is a specific signal to indicate that the vessel is not only engaged in fishing activities but also may be restricted in its ability to maneuver. The green lights serve to clearly communicate this status to other vessels, ensuring that they recognize the fishing vessel's specific operational condition.

In the maritime context, proper signaling is crucial for navigation safety. The use of two green lights is a well-established convention within the COLREGs (International Regulations for Preventing Collisions at Sea), allowing other mariners to identify the vessel's activity quickly. When looking at the other options, a flashing orange light or an all-round white light would not be appropriate signals for fishing vessels, as those are associated with different statuses or types of vessels. The combination of red and green lights typically indicates other scenarios and does not apply to fishing vessel signals, while two green lights specifically pertain to vessels engaged in fishing.