RR WRC-07
Operational procedures for
urgency and safety communications in the
global maritime distress and safety system (GMDSS)
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General
32.1 §1 Distress communications rely on the use of terrestrial MF, HF and VHF radiocommunications and communications using satellite techniques. Distress communications shall have absolute priority over all other transmissions. The following terms apply:-
The distress alert is a digital selective call (DSC) using a distress call format,
in the bands used for terrestrial radiocommunication, or a distress message
format, in which case it is relayed through space stations.
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The distress call is the initial voice or text procedure.
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The distress message is the subsequent voice or text procedure.
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The distress alert relay is a DSC transmission on behalf of another station.
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The distress call relay is the initial voice or text procedure for a station not
itself in distress. (WRC-07)
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Quelle: Radio-Regulations Chapter VII
Download: https://www.itu.int/dms_pub/itu-r/opb/reg/R-REG-RR-2016-ZPF-E.zip
aus dieser .zip die Datei RR2016Vol-I_EA5.pdf extrahieren (442 Seiten PDF) dort Kapitel 7