Element 7: GMDSS Radio Operating Practices

effective 8/01/2006

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7-A-033: Action to take after sending a false distress alert

7-33E1: What action should you take after sending a false Distress alert on VHF?

Make a voice announcement to cancel the alert on Ch-16.

Send a DSC cancellation message on Ch-70.

Make a voice announcement to cancel the alert on Ch-13.

Make a voice announcement to cancel the alert on Ch-22A.



7-33E2: What action should you take after sending a false Distress alert on MF?

Make a voice announcement to cancel the alert on 2182.0 kHz.

Make a voice announcement to cancel the alert on 2187.5 kHz.

Make a voice announcement to cancel the alert on 2174.5 kHz.

Send another DSC alert and follow on with voice on 2182.0 kHz.



7-33E3: What action should you take after sending a false Distress alert on MF?

Make a voice announcement to cancel the alert on 2182.0 kHz.

Send another DSC alert on 2187.5 kHz. and follow on with voice on 2187.5 kHz.

No action is necessary.

Send a DSC alert on all 7 DSC frequencies and follow on voice on 2174.5 kHz.



7-33E4: What action should you take after sending a false Distress alert on 8 MHz?

Make an "ALL STATIONS" call on 8291.0 kHz canceling the alert.

Make an "ALL STATIONS" call on all 5 H.F. TELEX channels canceling the alert.

Make a "MAYDAY" call on 8414.5 kHz canceling the alert.

Make an "Urgency" call  on 8614.0 kHz canceling the alert.



7-33E5: What action should you take after sending a false Distress alert on 12577.0 kHz?

Make an "ALL STATIONS" call on the associated 12 MHz J3E frequency canceling the alert.

No action is necessary.

Make an "ALL STATIONS" call on all 5 H.F TELEX frequencies canceling the alert.

Send a message to the nearest RCC via Inmarsat canceling the alert.



7-33E6: What action should you take after sending a false or accidental Distress alert on Inmarsat-C?

Select "Transmit" or "SEND/REC" menu and send a cancellation message via the LES used for the Distress alert.

Press the "Distress Hot Keys" then press the "cancel" key.

Do nothing until the RCC contacts your vessel to determine if the Distress alert was genuine.

Select the cancel false Distress alert option in the Distress Setup Menu and re-transmit the call.





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7-A-032: Distress Relays
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Element 7: GMDSS Radio Operating Practices
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7-A-034: Radio silence & resumption of normal traffic