Question 342 Deck Safety

The correct answer is A) D. The D signal, which is a continuous sounding of a whistle or horn, may only be made in compliance with the International Regulations for Preventing Collisions at Sea (COLREGS), also known as the International Rules of the Road. The D signal is used to indicate a vessel is maneuvering with difficulty and requires the give-way vessel to take early and substantial action to avoid collision. The other answer choices (F, Q, and U) do not represent single-letter sound signals that are specifically regulated by the International Rules of the Road in this manner.