Which Annex concerns signals for fishing vessels of 20m or more in length engaged in pair trawling?

The correct answer focuses on the fact that Annex III of the International Regulations for Preventing Collisions at Sea (COLREGs) specifically addresses the signals that fishing vessels, particularly those that are 20 meters or more in length and engaged in pair trawling, must follow. This annex details the sound signals these vessels are required to use to communicate their activity and intentions to nearby vessels, thereby enhancing safety and clarity in maritime operations.

Fishing vessels involved in pair trawling typically operate in close proximity to one another, necessitating clear communication to prevent collisions and ensure safe maneuvers. This is why Annex III is pertinent; it provides the guidelines that define the appropriate signals to indicate their operational status effectively.

Other annexes address different aspects of maritime navigation and safety, but it is Annex III that specifically targets the operational signals required for these fishing vessels engaged in pair trawling.