What must a radio operator do when overhearing a distress call?

When a radio operator overhears a distress call, the appropriate action is to monitor the channel and, if able, provide assistance. This protocol is critical because distress calls indicate that someone's safety may be in jeopardy, and help may be urgently needed. By monitoring the channel, the operator can stay updated on the situation and assess how they might contribute to the response, whether that's offering support or coordinating with other vessels or rescue services.

The obligation to assist in distress situations is grounded in maritime safety regulations and general communication protocols. The operator should remain attentive, ensuring they do not interfere with the ongoing communications while ready to act if necessary. This reflects the importance of collaboration and readiness in maritime operations, where every vessel plays a role in ensuring safety at sea.

Other options, like switching to another channel or ignoring the call, could severely hinder rescue efforts and could potentially put lives at risk. Sending a reply message may not always be the best choice unless the operator can do so without compromising their ability to monitor the situation accurately and provide support if required.