What is Global Maritime Distress and Safety System or GMDSS and its details?

Silence Distress :-

Any other stations may also impose silence, if it is necessary to do so, by using this.

Silence fini :-

Normal working may be resumed.

What are Cancellation procedures for false distress Alert :

 On VHF

1. Switch off the transmitter immediately if the false alert is detected during transmission.
2. Now switch on equipment and set to CH – 16.
3. Make broad cost to “all stations” giving the ship’s name, call sign, MMSI number  and cancel the false distress alert.

Example –

All stations (x3)
This is
Name  (x3)/ Call sign/ MMSI No.
Cancel my distress alert of date, Time (UTC).
Master
Name of ship/ call sign/ MMSI date/ time (UTC)0