Other services or the joint rescue coordination centre would call upon us when they know there's a ship or an airplane out there that somebody has lost contact with and has reported as potentially being lost. Our role then is to locate their radio signal and attempt to triangulate it so that we have an idea of where they are. Sometimes, because of the fact that we have very good radio receivers, it's possible for us to hear signals that other people cannot hear. For example, a normal base station or airport has lost contact with some airplane or some ship. They're still talking, but nobody is hearing them. They ask us to listen, and when we turn and look in that direction it is often possible to pick up signals and determine that they're actually not lost, that they're just out of communications.
In 2014, for example, there were only five instances where we were asked to do so. In three of them there was no actual emergency, but we were able to determine that this person was talking, but they weren't answering because they couldn't hear them. We could hear them, and it wasn't an emergency. On two of them, we did help to locate that the person was declaring an emergency, and we were able to say “they're about here”, which makes it easier for search and rescue to go find them.