AUTOMATIC DISTRESS SIGNAL UNIT
The radiotelegraphic distress signal consist of the group SOS, transmitted as a single signal in which the dashes are emphasized clearly from dots.
The radiotelephone distress signal consist of the word "MAYDAY" pronounced as the French expression "M'aider".
These distress signal indicate that a ship, aircraft or other vehicle is threatened by grave and imminent danger and request immediate assistance.
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