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

Note:-

•  Never substitute the name of the relaying station for that of the station in distress, even identification is difficult.
• If the station in distress cannot be identified, it should be referred to as “Unidentified Traveler” or unidentified helicopter” or “Unknown Vehicle”.

What is DSC or Digital Selective Calling :

The calling sub system in GMDSSC being used as “Primary alerting system” of VHF, MF, HF and terrestrial service. DSC provides automated access to coast stations and ships.

Level of priority:-

1. Distress
2. Urgency
3. Safety
4. Routine

All level of priority are available for DSC calls.