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.

distress signal

A signal transmitted by an aircraft in distress. It could be transmitted on radio as Mayday or by light indications.
References in periodicals archive ?
But until recently, researchers believed that plants use the same SOS distress signal - no matter what the attacker.
A SURVIVOR of the Titanic disaster is to visit the mill where a distress signal from the stricken ship was heard.
The SARSAT payload is a radio repeater that flies aboard meteorological satellites and receives distress signals from Emergency Locator Transmitters (ELT) on downed aircraft, from Emergency Position-Indicating Radio Beacons on board ships, and from Personal Locator Beacons carried by hikers and campers.
Scientists also know that the amphibians, when captured, send out chemical distress signals.
The Titanic hit an iceberg on her maiden voyage to America and sent out frantic distress signals as she began to sink.
Soldini went to her rescue when race officials appealed for help after receiving distress signals on Monday during the Around Alone yacht race from New Zealand to Uruguay.
The distress signals were out on Causing Chaos at the time, but Nigel Twiston-Davies's gelding picked up well between the last two fences and was soon away from the tiring longtime leader following a fluent leap at the last.
They were removed by the army for forensic examination and were later identified as rockets used by ships to send out distress signals.
The electronic position indication radio beacon has a hydro-static release which lets it break free and start sending distress signals as soon as any vessel goes under.
It was only when the distress signals continued that coastguards began to consider the possibility of there being two boats with the same name.
It states that the mix-up over the distress signals delayed the launch of the rescue operation by several hours.