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Prior to the GMDSS, the number and type of radio safety equipment ships had to carry depended upon its tonnage. With GMDSS, the number and type of radio safety equipment ships have to carry depends upon the GMDSS areas in which they travel. GMDSS sea areas are classified into the following four areas: A1, A2, A3 and A4.
DSC equipment, a part of the Global Maritime Distress Safety System (GMDSS), provides all the functionality of voice-only equipment and, additionally, allows several other features: The ability to call another vessel using a unique identifier known as a Maritime Mobile Service Identity (MMSI). This information is carried digitally and the ...
Meteorological forecasts are broadcast on VHF and MF as part of the GMDSS at particular times, with AVURNAV (Urgent advice to Navigators) or BMS (Special Meteorological Bulletin) as needed. Marine VHF channel 16, 2182 kHZ, and DSC (Digital Selective Calling) channel 70 (2187.5 kHz) are used.
Second, the targeted group must be selected, if necessary. This can be all ships, ships of a specific geographic area, or an individual ship. Lastly, the call should be made. GMDSS protocol requires that the safety call must be spoken to attract attention of the selected vessels. Procedure for the call is: [1]: 41 SÉCURITÉ x 3 ALL STATIONS x 3
For much of the 20th century, 500 kHz was the primary international distress frequency. Its use has been phased out in favor of the Global Maritime Distress Safety System.
Hold or qualify for a GROL, GMDSS Radio Maintainer's License, First Class Radiotelegraph Operator's Certificate, or Second Class Radiotelegraph Operator's Certificate. Those last two licenses are no longer issued. The Radiotelegraph Operator's License (T), issued in May 2013, also can have added to it a ship radar endorsement.
Inmarsat-C terminal (centre) Inmarsat-C is a two-way, packet data service operated by the telecommunications company Inmarsat which operates between mobile earth stations (MES) and land earth stations (LES).
With the advent of the Global Maritime Distress Safety System (GMDSS), the role of AMVER was redefined to complement the emerging technology. Rescue coordination centers around the world began using Electronic Position Indicating Radio Beacons (EPIRBS), Inmarsat-C and Digital Selective Calling terminal auto-alarms to "take the search out of ...