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Subel. I
6 questions
Subelement I

Inmarsat Equip. & Comms:

Section 66

Inmarsat-C

Which of the following best describes Inmarsat-C operation?

  • Is an analog-based system.
  • Requires a stabilized directional antenna.
  • Provides for voice, TELEX, high and low-speed data and compressed video communications.
  • Correct Answer
    Is a digital store-and-forward system that also provides Enhanced Group Call, data reporting, polling and Distress alerting capabilities.
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Which of the following best describes a shipboard Inmarsat-C system?

  • Correct Answer
    A small, lightweight terminal capable of providing satellite store-and-forward message communications.
  • A satellite communications system that provides real-time connectivity.
  • A small, lightweight terminal used to transmit messages over high frequency (HF) bands to communicate through a satellite.
  • A satellite communications system that also provides continuous Digital Selective Calling coverage for all ocean regions.
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How are Inmarsat-C LESs selected by the operator?

  • The operator can program the terminal for their preferred default LES codes for Distress and routine communications.
  • Correct Answer
    The NCS for each ocean region downloads the current LES codes into the terminal.
  • The NCS selects the optimum LES code for both Routine and Distress communication.
  • The LES codes can be selected for routine communications but the NCS chooses the best LES for Distress Alerts.
  1. The NCS in a region is assigned a common channel.
  2. Each channel using a different frequency is how transceivers select an NCS, satellite/ region.
  3. The receiver will try synchronizing with the NCS on a common channel.
  4. Default programming means the S.E.S. transceiver tunes to the NCS and CC Frequency.
  5. The NCS CC signal level indicating signal strength is required for routine operation.
  6. The NCS can also be manually selected.

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Which statement about Inmarsat-C LESs is true?

  • LESs are only available in the Ocean Regions that overlap one another.
  • LESs are only available in the Ocean Region controlled by their NCS.
  • Correct Answer
    Some LESs are available in all four footprints due to the cloud-based NGC mode.
  • All LESs are available in all four footprints due to the cloud-based NGC mode.
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It is possible to transmit all of the following via Inmarsat-C from a vessel EXCEPT?

  • TELEX
  • Text for delivery by fax.
  • Correct Answer
    Voice
  • x.400 data services
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Which of the following best describes the full range of services provided by the Inmarsat-C Satellite system?

  • Polling, enhanced group call, and one-way position and data reporting via satellite.
  • FM voice communications via satellite.
  • Two-way messaging and data communications on a store-and-forward basis.
  • Correct Answer
    Polling, enhanced group call, one-way position and data reporting via satellite, two-way messaging and data communications on a store-and-forward basis.
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