emergency frequencies
Crisis communication bands
Emergency frequencies are radio frequencies reserved for distress calls and urgent communications.
In aviation, 121.5 MHz is the international emergency frequency; in maritime use, it's VHF channel 16.
These frequencies are monitored continuously by rescue services and other operators: The pilot switched to the emergency frequency when the engine failed.
Citizens band radio designates channel 9 for emergencies.
- mayday callSpoken emergency distress signal
- two-way radiosPortable send-receive communicators
- natural disastersCatastrophic environmental events
- distress signalsUrgent pleas for rescue
- SOS signalUniversal emergency transmission
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