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Subelement I
Inmarsat Equip. & Comms:
Section 78
Equipment Faults and Maintenance-1:
A vessel with an 18-hour ETA to the Panama Canal on a voyage from Miami loses the ability to communicate via Inmarsat. The most likely cause is?
  • The vessel has sailed beyond the coverage area of the Southbury Land Earth Station.
  • The vessel has sailed beyond the coverage area of the Eastern Atlantic satellite.
  • The vessel has sailed beyond the coverage area of the Western Atlantic satellite.
  • Correct Answer
    An equipment fault resulting in a loss of signal from the satellite.
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A vessel, before transiting the Panama Canal, on a voyage from San Diego to Miami, loses the ability to communicate via Inmarsat. The most likely cause is:
  • Correct Answer
    The vessel has sailed beyond the coverage area of the Pacific satellite.
  • The vessel has sailed beyond the coverage area of the Southbury Shore Station.
  • The vessel has sailed beyond the coverage area of the Western Atlantic satellite.
  • The satellite orbit is beyond the usable range of the SES.
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What can be the visual observation of a condition whereby it may be possible to initiate a reliable Inmarsat TELEX transmission but a voice transmission may not be possible?
  • An indication on a meter or on the display terminal of high transmit power.
  • Correct Answer
    An indication on a meter or on the terminal of low receiver signal strength.
  • An indication of a very high antenna elevation on the display terminal screen.
  • An indication that the antenna has reached its maximum travel in one direction.
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What maintenance function may the holder of a GMDSS Radio Operator license perform, or supervise the performance of, on an Inmarsat-C SES?
  • Adjust the station's EIRP (power output ) for improved signal levels.
  • Enter Azimuth and Elevation values correctly so the Inmarsat-C SES can find the NCS CC.
  • Correct Answer
    Remove stack deposits and other debris from the antenna to prevent degraded performance.
  • Adjust a reference oscillator or synthesizer to tune the unit to the NCS CC.
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What maintenance function may the holder of a GMDSS Radio Operator license perform, or supervise the performance of, on an Inmarsat-C SES?
  • Painting the antenna dome.
  • Adjust the station's EIRP.
  • Correct Answer
    Adjust any front panel controls.
  • Adjust a reference oscillator or synthesizer.
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Which functions may the holder of a GMDSS Radio Operator License NOT perform on the Inmarsat-C equipment?
  • Maintain the antenna clear of soot, paint, etc.
  • Log-on, traffic and log-off functions.
  • Entry of position data and selection of LES.
  • Correct Answer
    Optimize performance by adjusting the transmitter EIRP.
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