【多选题】
A exchange procedure: This applies when two or more stations achieve communication with each other.
B Broadcast procedure: Broadcast procedure applies when a station transmits without expecting a response from any other station or a station transmits without knowing if a response from another station will be received or not.
C distress communication procedure : A ship or aircraft is threatened by grave and imminet danger ,and requests immediate assistance. A distress message is marked by Mayday.
D Urgency communication procedure: The station sending it has
a very urgent message to transmit concerning the safety of a ship, aircraft or other vehicle, or the safety of a person. An urgency message is marked by Pan-Pan .
E Safety communication procedure : The station sending it has a message to transmit containing an important navigational or meteorological warning . A safety message is marked by Securite.
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