When is a diamond shape required on a towed vessel?

A diamond shape is required on a towed vessel when the tow exceeds 200 meters in length. This requirement is specified in the International Regulations for Preventing Collisions at Sea (COLREGs) and is intended to enhance the visibility of longer towed vessels, ensuring that other vessels can identify them from a distance. The diamond shape serves as a day shape, signaling the length of the tow to other vessels, which is crucial for navigation and safety to avoid collisions.

In maritime safety practices, recognizing the size and nature of a vessel, especially those that are long and may be less maneuverable, is vital. Therefore, when a tow is longer than 200 meters, displaying a diamond shape effectively communicates this extended length to nearby vessels, prompting them to take necessary precautions.

While there are other lengths mentioned as options, they do not meet the specific regulatory requirement for displaying a diamond shape, which is only mandated when the tow exceeds 200 meters. Understanding this regulation helps ensure smooth navigation and safety on the waters for all vessels involved.