Under what conditions should a Mayday Relay message be sent?

A Mayday Relay message should be sent if you hear a distress call from another vessel that is not receiving a response. This situation indicates that the distressed vessel is in need of urgent assistance, and as a bystander or nearby vessel, you have a critical role in ensuring that help is dispatched as quickly as possible. By relaying the distress call, you can inform the relevant authorities or other vessels in the vicinity about the emergency, increasing the chances of a timely response.

This is a standard procedure in maritime emergency protocols, emphasizing the importance of communication in distress situations and the responsibility of other vessels to assist when they are aware of a distress call. It also underscores the necessity of being vigilant and ready to take action when another vessel is in trouble.