distress signal

(redirected from distress signals)
Also found in: Dictionary, Thesaurus.

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 ?
The coast guard received a distress signal from Outen's boat at about 10:40 a.
They send distress signals through a satellite run by the National Oceanic and Atmospheric Administration.
was Captain Charles McVay's anguished thought as distress signals went unheeded.
Creatures that prey on caterpillars home in on these distress signals.
But the 10-year-old was struggling to keep tabs on leader Fighting Times going out on the final circuit and the distress signals were well and truly out as McCoy's push became pump with little response.
By emitting chemical distress signals, some corn, cotton, and tobacco plants can summon tiny parasitic wasps to rescue them from hungry caterpillars like the tobacco budworm and corn earworm.
If as he says, we face an "ecological holocaust," if "the planet earth is sending out distress signals," if what we face is a "nightmare world," then we can change.
M2 EQUITYBITES-September 16, 2015-911Cellular indoor positioning system pinpoints mobile distress signals
01 on Betfair before the last but the distress signals were soon being emitted as the odds-on favourite hit the wall.
It was only inside the final furlong that distress signals started to show and Halicarnassus eventually closed right down to within a neck.
The official reportedly said that the aircraft did not issue distress signals or report mechanical problems and although the crew reported winds as high as 74 knots before losing contact with the ground on 1 January, there were no complaints regarding navigation, the condition of the aircraft itself or other technical problems.