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1. INMARSAT C SYSTEM
OVERVIEW
1.1 Introduction
The Inmarsat C system provides worldwide telex and data transmission and reception
of written information to owners of an Inmarsat C transceiver or a terrestrial telex net-
work via satellite. Further, e-mail can be sent via the internet.
Communication mode is store-and-forward telex, which means all information sent are
first stored at an LES (Land Earth Station) and then delivered to designated party.
An EGC (Enhanced Group Call) receiver is built in the FELCOM system to receive the
following types of messages, broadcast by LESs:
• SafetyNET: Governments and maritime authorities can use this service to distribute
maritime safety information to ships within selected areas.
• FleetNET: Commercial subscription organizations or shipping companies can use
this service to transmit trade information (for example, company news or market
prices) simultaneously to a selected group of ships, to provide up-to-the-minute in-
formation.
• EGC system-related messages are sent by Inmarsat to certain shipping companies
and geographical areas.
Besides its primary application of ship-shore, shore-ship or ship-ship communications,
the Inmarsat C service has also proved beneficial to trucking firms who have found it
indispensable for communicating with their vehicles. This manual, however, concen-
trates on the ship applications, the main application.
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