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Important: the radio watch and contact with the vessel in distressshould continue until all activity has ended. A distress or urgency callcan be cancelled by transmitting a message advising that assistanceis no longer required. After that time, a normal listening watch shouldbe maintained.When circumstances change, a vessel that has broadcast a MAYDAYmay change the message to a PAN PAN when grave and imminentdanger has passed. A PAN PAN can also be upgraded to a MAYDAYif a situation deteriorates.Urgency signal and messageThe radio-telephone urgency signal is PAN PAN (spoken three times)and indicates that the calling station has a very urgent message totransmit about the safety or operational capability of a vessel, or abouta person in difficulty. Medical emergencies are normally designated asPAN PAN messages.The urgency signal has priority over all other communications exceptdistress. All stations hearing it must take care not to interfere with thetransmission of the message that follows.The urgency message may be addressed either to ALL STATIONSor to an INDIVIDUAL STATION. As soon as the station responsiblefor transmitting the urgency message knows that action is no longernecessary, it must cancel the message.The urgency signal and message should be sent on any internationaldistress frequency or channel for radio-telephone. In the case of a longmessage or medical call, the caller should change to a working frequency.RADIO HANDBOOK19