Safety, Fire & Survival · GMDSS — False Alert Cancellation
If a DSC distress alert is transmitted accidentally, the operator should:
- ASwitch off the radio and say nothing
- BIgnore it and hope no one responds
- CImmediately cancel it per procedure and broadcast a voice message on Ch 16 stating the alert was inadvertent and is cancelled✓ Correct
- DSend a SECURITE message only
Explanation
False alerts must be cancelled at once: cancel the DSC alert as the equipment allows, then transmit an 'all stations' voice message on the working/distress channel giving the ship's name, call sign/MMSI, and a statement that the distress alert was inadvertent and is cancelled.
Authority: IMO GMDSS; ITU Radio Regulations; false-alert guidance
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