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Subelement I
Inmarsat Equip. & Comms:
Section 63
Inmarsat General System Operations-2:
What is an MRN?
  • Mobile Registration Number, provided by the FCC.
  • Mobile Registration Number, provided by IMO.
  • Correct Answer
    Message Reference Number, provided by the LES.
  • Vessel's call sign
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To keep the Inmarsat-B or F77 antenna pointing at the desired satellite, regardless of the ship's position and course, it has an input from the vessel's:
  • Operational radar
  • Automated Radar Plotting Aid (ARPA equipped radar)
  • Steering control system
  • Correct Answer
    Gyrocompass
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The Inmarsat telephone and TELEX communications channel usage scheme is:
  • Correct Answer
    One ship per telephone channel and many ships per TELEX channel.
  • Many ships on the same TELEX analog channel and many ships on the same TDM telephone channel.
  • One ship per analog telephone channel and one ship per TELEX analog channel frequency.
  • One ship per channel whether telephone or TELEX.
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What is an "Inmarsat Mobile Number"?
  • This identifies the vessel's selective calling (SELCAL) number.
  • Correct Answer
    This is the Inmarsat number that is assigned to a unit for incoming or outgoing calls.
  • This is the vessel's Inmarsat registration number for accounting authority purposes.
  • This number is used for receiving news and other optional services in FleetNETTM.
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Which of the following statements concerning Inmarsat geostationary satellites is true?
  • They are in a polar orbit, in order to provide true global coverage.
  • Correct Answer
    They provide coverage to vessels in nearly all of the world's navigable waters.
  • They are in an equatorial orbit, in order to provide true global coverage.
  • Vessels sailing in equatorial waters are able to use only one satellite, whereas other vessels are able to choose between at least two satellites.
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What is the primary purpose of an Inmarsat LES?
  • The LES is required for ship-ship Inmarsat communications, ship-shore communications are handled by terrestrial Coast Radio Stations.
  • The LES monitors all operations of the satellite and assigns channels and frequencies to the vessel.
  • Correct Answer
    The LES makes the satellite connection between the vessel and the requested destination for all types of services.
  • The LES is dedicated only to processing all vessel Distress priority calls.
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