Satellite communication facilities are provided by the International Maritime Satellite Organization, INMARSAT. The organization was founded in September 3, 1976 and first introduced into the global commercial operation in 1982. Its main task is to

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• Satellite communication facilities are provided
  by the International Maritime Satellite
  Organization, INMARSAT. The organization was
  founded in September 3, 1976 and first introduced
  into the global commercial operation in 1982. Its
  main task is to provide satellite-based services
  for maritime communication, and to improve
  distress and safety services.

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• Telephone and Telex
• Inmarsat-B
• Inmarsat-Fleet 77
• Telex
• Inmarsat-C
• Telephone
• Inmarsat-M

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Overview

• Three Major Components
• Satellite
• Coast Earth Stations (CES)
• Ship Earth Stations (SES) Land-Mobile Earth
  Stations (LMES) Aircraft Earth Stations (AES)

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Satellite
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CES
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SES LMES AES
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Network Operations Centre

• The heart of the system is the NOC located at
  Inmarsat headquarters in London. Operating 24
  hours a day, it monitors, co-ordinates and
  controls the operational activities of all
  satellites in the network.

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• Ocean Region Satellites
• AORW Atlantic Ocean Region West
• AORE Atlantic Ocean Region East
• IOR Indian Ocean Region
• POR Pacific Ocean Region

Equipment Telex Telephone
Inmarsat-B 580 870
Inmarsat-C 580
Inmarsat-M 870
Fleet-77 580 870
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The Space Segment

• Geostationary Orbit
• 35,700 Km over the major ocean regions
• Moves at exactly the same rate as the rotation
  of the earth
• Equipped with solar panels
• Almost Global coverage with the exception of the
  polar regions above 76 degrees North and below 76
  degrees South
• Able to handle up to 400 simultaneous phone
  calls, or several thousand messages.

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Network Co-ordinating Station

• It is located within each ocean region
• Acts as a type of switch operator assigning,
  controlling and monitoring all of the telephone
  and telex channels between the SES and the CES.

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OCEAN REGION 1
OCEAN REGION 2
LES
LES
NOC
MES
MES
NCS
NCS