emergency signals
Urgent warning transmissions
Emergency signals are communications that indicate urgent distress and request immediate assistance.
These include visual signals like flares and distress flags, audio signals like sirens and SOS in Morse code, and electronic transmissions like mayday calls and emergency beacons.
The term covers both the signals themselves and the systems that transmit them: The ship's emergency signals were detected by the Coast Guard.
- alarm bellAudible danger signal
- fire alarmEmergency heat warning device
- flareSudden bright burst
- beaconGuiding light source
- Morse codeDot-dash signaling system
semaphore · strobe light · mayday · distress call · klaxon · pyrotechnics · signal flag · red flag · SOS · radio transmission · whistle · horn · smoke signal · 911 · siren · amber alert · buzzer · satellite phone
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- telegraphytelegraph, Morse code, telegraphy, telegraph key, telegraph line
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