United States Coast Guard Captains License Practice Exam

In which scenario must a vessel sound a danger signal?

1. When crossing a vessel's path

2. When signaling an imminent collision

3. When its engine is not functioning

4. When it is about to anchor

The correct answer is: When signaling an imminent collision

A vessel must sound a danger signal when signaling an imminent collision because this action serves as a critical means of communication to other vessels in the area, alerting them to an immediate and serious risk of collision. This situation requires urgent attention, and the sound of the danger signal conveys the urgency and necessity for other vessels to take corrective action to avoid a collision. In contrast, while crossing a vessel's path might warrant caution, it does not necessarily indicate an imminent conflict where a danger signal would be required. An engine malfunction or an intention to anchor, while potentially problematic, does not create an immediate threat that necessitates sounding a danger signal. Therefore, only the situation involving an imminent collision demands such a response to ensure safety on the water.