GMDSS Sea Areas For the needs of the G.M.D.S.S applications, sea areas have been world widely characterized as: Sea Area A1. Within the radiotelephone coverage of at least one VHF coast station in which continuous DSC alerting is available. Such an area could extend typically 20- 50 nautical miles from the coast station. Sea Area […]

Every vessel during at sea has to be capable of performing the nine radio-communication functions of the GMDSS, viz: – Transmission of ship-to-shore distress alerts by at least two separate and independent means, each using a different radio-communication service. – Reception of shore-to-ship distress alerts. – Transmission and reception of ship-to-ship distress alerts. – Transmission […]

They are divided into conventional and satellite communications Conventional (terrestrial) communications: They operate in the MF, HF, and VHF frequency areas. They use the digital selective-calling (DSC), radiotelephony, radioteletypy, NAVTEX and RADAR transmitters. Satellite communications: They are conducted via the satellite systems Inmarsat and Compass-Sarsat. Inmarsat: International satellite maritime organization that operates with four geostationary […]