Which situation requires a vessel to display a distress signal?

A vessel is required to display a distress signal in situations where it is in serious jeopardy or requires immediate assistance. The scenario where a vessel is taking on water and needs assistance clearly indicates an emergency situation. This requires immediate action, as the vessel’s safety and the safety of anyone on board are at risk. The use of a distress signal in this context effectively communicates to nearby vessels or authorities that urgent help is needed.

In contrast, while experiencing engine troubles might present a challenge, it does not necessarily indicate an immediate threat to the vessel’s safety, hence does not require a distress signal. Similarly, engaging in search and rescue operations implies active engagement and operational status rather than indicating a state of distress. Lastly, when a vessel is in port awaiting cargo, it is in a safe status and does not need to signal distress since there is no immediate danger.