In a distress message acknowledgement, which phrase is repeated three times?

In a distress message acknowledgement, the phrase that is repeated three times is the call sign of the station acknowledging the distress call. This is a crucial aspect of maritime communication to ensure clarity and confirmation during critical situations. By repeating the call sign, it helps to identify the station responding and reinforces the connection between the communicating parties. This repetition provides assurance to the sender that their message has been received and acknowledged by the appropriate authority, which is especially vital in emergency situations.

The other phrases are important in the context of distress messages but do not serve this specific purpose of acknowledging reception with repetition. "MAYDAY" is the signal for distress, while "RECEIVED MAYDAY" confirms understanding but does not require repetition of the call sign. "THIS IS" is not relevant in this specific case of distress message acknowledgement.