Marine Order 21, issue 8
41Urgency messages
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41 Urgency messages
41.1 If an urgency message that follows the urgency signal is a long message, a medical call or, in an area of heavy radio traffic, a repeated message, the radio frequency used for the message must:
(a) not be the distress frequency; and
(b) be stated in the DSC urgency announcement or urgency message.
41.2 A person must not interfere with the transmission of the urgency message that follows the transmission of the DSC urgency announcement or urgency signal.
41.3 When the master of a ship who sent the urgency message is satisfied that action called for by the urgency message is no longer necessary, the master must ensure that a further message is transmitted cancelling the urgency message.