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This section provides an overview of the Inmarsat satellite communications system and 
networks.

The satellite communication system (SATCOM) comprises global satellite networks, Land 
Earth Stations (LES), and Mobile Earth Stations (MES).

Satellite communication systems provide users with long-range voice and data 
communication by accessing global satellite and ground communications networks.

Inmarsat is an international organization that operates and maintains the satellites and 
satellite networks. Inmarsat operates multiple geostationary satellites. Each satellite is 
located over an oceanic region; the current ocean region names are:

•

Atlantic Ocean Region-East (AOR-E)

•

Atlantic Ocean Region-West (AOR-W)

•

Indian Ocean Region (IOR)

•

Pacific Ocean Region (POR)

These satellites provide worldwide telecommunication services for aviation, shipping, and 
land-mobile terminal users. The satellites connect to ground telecommunication systems 
through the LES.

The HSD transceiver, in conjunction with an ARINC 741 Aero H/H+ antenna subsystem, 
acts as an MES. The combined system provides users with a data and voice 
communications link to the satellite network and global telecommunications system. 

Figure 1–9 illustrates a simplified satellite communications system.