Question 989 Rules of the Road

The correct answer is A) A whistle signal. According to the International Regulations for Preventing Collisions at Sea (COLREGS), in restricted visibility, a vessel aground is required to make the bell and gong signals, but the whistle signal is optional. The bell and gong signals are mandatory to indicate the vessel's position and alert other vessels in the vicinity. However, the whistle signal, while recommended, is not a required signal in this situation. The other options, B) a bell signal and C) a gong signal, are incorrect because they are mandatory signals, not optional, for a vessel aground in restricted visibility.