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Subelement I
Inmarsat Equip. & Comms:
Section 61
Inmarsat Log-in & Log-out:
Which action must be taken to ensure that incoming message traffic of all priority levels will be received through Inmarsat-C?
  • Correct Answer
    The GMDSS Radio Operator must log-in to the desired satellite (if the unit did not automatically do so.)
  • No additional action is necessary after turning on the receiver and aiming the antenna at the desired satellite.
  • The system needs only to be commissioned and turned on.
  • The GMDSS Radio Operator must log-in to the desired satellite and receive the message reference number (MRN) from the LES.
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When logging into the Inmarsat system using Inmarsat-C, it is necessary to:
  • Enter your IMN.
  • Correct Answer
    Select the Ocean Region.
  • Enter the LES answer back.
  • Call the LES and inform them that you are now operating in the appropriate ocean region.
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What action should be taken on changing from one ocean region to another?
  • Power the system down and turn the power back on again.
  • Manually realign the antenna.
  • Correct Answer
    Log out of the current satellite and log in to the correct satellite.
  • No action is required -- the unit will scan for another satellite and log in.
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What is the primary danger of improperly logging out?
  • The vessel will be barred in the future from sending traffic through an LES.
  • The NCS ensures that improper log-out procedures do not occur.
  • Scheduled MSI may not be available through the Inmarsat-C terminal.
  • Correct Answer
    Your company or another ship may accrue significant charges when their traffic is repetitively sent to your unavailable terminal.
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Which of these can take place on an Inmarsat-C terminal that has synch with the NCS CC but has not yet performed a successful login?
  • Correct Answer
    Reception of unscheduled MSI Urgency and Distress messages.
  • Transmission of synoptic weather reports and company traffic.
  • Reception of the mandatory scheduled BALD MSI messages.
  • Reception of company traffic related to ship's business.
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Which of the following is not an example of a failure to log-out properly?
  • Turning off the power prior to logging out with the NCS.
  • Correct Answer
    A message on the screen or printer from the NCS.
  • Sailing the vessel into a shadowing or local RF interference situation before logging out.
  • Sailing out of the footprint of a satellite before logging out.
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