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distress signal

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distress signal [də′stres ‚sig·nəl]
(communications)
An international signal used when a ship, aircraft, or other vehicle is threatened by grave and imminent danger and requests immediate assistance; examples are special radiotelegraph and radiotelephone signals or special signal flags or flares.


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1906: SOS was established as an international distress signal.
1906: SOS was established as an international distress signal.
location in the sea by transmitting a digital signal on the international distress signal frequency on 406 MHz.
 
 
 
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