Question 893 Rules of the Road

The correct answer is A) May be supplemented by an appropriate light signal. The danger signal, which is the sounding of five or more short, rapid blasts on the vessel's whistle or horn, indicates that the vessel is in distress and requires immediate assistance. This signal can be supplemented by an appropriate light signal, such as flashing the vessel's navigation lights, to further convey the distress situation. The other options are incorrect: B) is incorrect because the danger signal itself indicates the vessel is in distress, not just the signal; C) is incorrect because the danger signal can be sounded by any vessel in distress, not just the stand-on vessel; and D) is incorrect because the danger signal is not used to indicate a course change.