Question 907 Rules of the Road

The correct answer is D) It indicates doubt as to another vessel's actions. The danger signal is a series of short, rapid blasts on the whistle, which indicates uncertainty or doubt about another vessel's actions or intentions. This signals to the other vessel that you are unsure of their course of action and need them to take appropriate measures to avoid a collision. The other answer choices are incorrect because: A) The danger signal does not replace directional signals, it is an additional communication. B) The danger signal does not have the same meaning as a "MAYDAY" signal, which indicates a life-threatening emergency. C) The danger signal does not make the other vessel the stand-on vessel, it simply expresses uncertainty about their actions.