The GMDSS (Global Maritime Distress and Safety System) contains a set of internationally recognised procedures and maritime rules. These rules define the types of systems and communication protocols used to improve sea rescue, reception of the SARSAT AIS and make rescuing vessels at sea easier. The GMDSS includes the DSC functions including distress alert, search and coordination, location (which can be associated with the AIS targets), the broadcast of maritime safety information, general communications and interconnection of maritime radio communication with the telephone network.

Prescom’s GMDSS MVCS communication system complies with the recommendations and regulations defined by IMO and the ITU. Its main functions are:

  • Use the different types of local or distant radio transmitters and receivers in the sea rescue coordination centres (VHF, Aero VHF, MF/HF and HF),
  • Control the transmitters and receivers managed by the centres,
  • Monitor the Maritime radio channels (channel 16, channel 13, etc.),
  • Manage Digital Selective Calling (DSC) for zones A1, A2 and A3,
  • Use radio-telephony in zones A1, A2 and A3,
  • Manage the NAVTEX,
  • Manually or automatically broadcast Maritime Safety Information (MSI)
  • Record and archive the DSC messages,
  • Broadcast information on several sites
  • Optimise communications via multiple paths on IP or analogue mode (radio recovery, echo cancellation, etc.)
  • Multichannel immediate playback,
  • Recording of communications,
  • Use of AIS data on operator consoles with a record of positions, chart display
  • IP links using ED137-B standard protocol