What is the day signal for a vessel engaged in trawling?

The day signal for a vessel engaged in trawling consists of two black triangles with apexes touching, which is the standard requirement set by the International Regulations for Preventing Collisions at Sea (COLREGs). This specific signal indicates that the vessel is actively working and is engaged in fishing with gear that restricts its ability to maneuver.

Using two black triangles ensures that other vessels can clearly identify the trawler's status from a distance, promoting safety during operation, especially in busy maritime areas. This signaling is crucial for effective communication at sea, helping to prevent collisions and ensuring that vessels navigating nearby are on alert regarding the trawler's activities.