Long Range Service Terrestrial communication
HF provides long-range service for use in the ship-to-shore and shore-to-ship directions. In areas covered by Inmarsat, it can be used as an alternative to satellite communications and outside these areas, it will provide the only long-range communications capability.
DSC (kHz) Telephony (kHz) Radiotelex (kHz)
- 4 MHz 4297.5 4125 4177.5
- 6 MHz 6312.0 6215 6268.0
- 8 MHz 8414.5 8291 8376.5
- 12 MHz12577.0 12290 12520.0
- 16 MHz16804.5 16420 16695.0
Medium-Range Service Terrestrial communication
A medium-range service is to be provided on frequencies in the 2MHz band (MF). In the ship-to-shore, ship-to-ship and shore-to-ship directions, the following distress frequencies are used:
* DSC – 2187.5 kHz
* Radiotelephony – 2182 kHz
* Radiotelex (NBDP) – 2174.5 kHz
* NAVTEX – 518 kHz Short-Range Service
Terrestrial communication VHF will provide a short-range service on the following distress frequencies:
* DSC – 156.525 MHz (channel 70)
* Radiotelephony – 156.8 MHz (channel 16)
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The Inmarsat System
Inmarsat provides the space segment necessary for instant and reliable distress and safety accessed by users on board vessels fitted with either Inmarsat –A, B and C terminals. These terminals can be used to satisfy most of the medium and long-range communications functions specified in the GMDSS.
Inmarsat Concept
Ships fitted with Ship Earth Stations (SES) can also be utilized for originating and receiving communications with other ships involved in distress cases. When multiple ships are involved, the Enhanced Group Call (EGC) system can be advantageous for operational updates and planning actions from RCCs. These ships can also be directly contacted by RCCs via telephony or telex. An RCC may also be equipped with an Inmarsat terminal (SES) for SAR communications. Inmarsat Enhanced Group Calling System (EGC) Inmarsat also provides capability for an L-band satellite EPIRB service called Inmarsat-E. This satellite EPIRB will float free from a sinking ship and automatically transmit the distress alert including the position of the incident. The COSPAS-SARSAT System A satellite distress alerting system based on low altitude near polar orbiting satellites designed to locate distress beacons (EPIRBs).
The COSPAS-SARSAT EPIRBs transmit signals that are received by their satellites. These signals are then relayed to ground receiving stations called Local User Terminals (LUTs), which process the signals to determine the location of the EPIRB. Each LUT is, in turn, linked to a Mission Control Center (MCC) and alert messages are forwarded to the appropriate RCC for action.
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