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Subel. I
6 questions
Element 7 (Valid until Apr 6, 2022)
Subelement I

Inmarsat Equip. & Comms:

Section 79

Equipment Faults and Maintenance-2:

What immediate remedy can be used to correct shadowing of the satellite signal by a shipboard obstruction?

  • Relocate the mast or other obstruction.
  • Raise the transmit power level.
  • Correct Answer
    Change the ship's course.
  • Increase the receiver gain.
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A vessel loses Inmarsat-B SES operation after a large course change. Which of the following could most likely cause this?

  • Shadowing of the SES antenna by clouds or other weather formations.
  • Misalignment of the shadow correction filter.
  • The vessel sailed beyond the footprint of the satellite coverage.
  • Correct Answer
    System loses gyro follow-up or a gyro system malfunction.
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Which statement is correct regarding a method that a vessel experiencing problems with shadowing of an Inmarsat-B (or F77) SES antenna by an on-board obstruction could use to attempt reliable communications?

  • Correct Answer
    Change course to remove the shadow.
  • Change the Coast Station ID programming.
  • Install a shadow correction filter.
  • Switch from TELEX to voice mode.
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Which of the following conditions does not typically impair Inmarsat-B communications ?

  • An obstruction, such as a mast, blocking the signal between the satellite and the SES antenna when the vessel is steering a specific course.
  • Correct Answer
    Normal precipitation from gales and storms.
  • A satellite whose signal is on a low elevation, below the horizon.
  • Travel beyond the effective radius of the satellite.
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A vessel is experiencing problems tracking the satellite in an Inmarsat-C SES while at sea. The problem is least likely caused by?

  • Extremely heavy rain/snow storms.
  • Correct Answer
    Local RF interference by in-port cell phone or other radio systems.
  • Shadowing caused by an obstacle, such as a mast, between the SES antenna and the satellite.
  • The vessel is on the fringe of the coverage area of the satellite.
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Which functions may the holder of a GMDSS Radio Operator License not perform on the Inmarsat-C equipment?

  • Selection of LES for routine traffic.
  • Maintain the antenna clear of soot, paint, etc.
  • Correct Answer
    Adjust the azimuth and elevation values.
  • Logon, traffic and logoff functions.
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