Which phrase is included in the distress message acknowledgement procedure?

In the context of distress message acknowledgments in marine and aeronautical communication, the phrase "THIS IS" is a critical component. This phrase follows the distress call, allowing the station that received the distress signal to identify themselves before relaying any further information.

When a station responds to a distress message, they must clearly indicate who they are, and using "THIS IS" serves to confirm their identity succinctly. It provides clarity and ensures that the communication is formally recognized, which is essential in emergency situations where every second matters.

The other phrases, while relevant in various contexts, do not serve the same purpose. For instance, "HELP ME" conveys an urgent need for assistance but lacks the specific protocol structure required for an official response. "I REPEAT" could be used to reiterate a message but does not follow the standard acknowledgment protocol. "EMERGENCY," although indicative of a situation requiring immediate attention, does not function as an identifier in distress message acknowledgments.