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Subelement I
Inmarsat Equip. & Comms:
Section 59
Sat-C, Power up, Self-Test, Controls & Lamps:
Which of the following actions should be taken once the vessel is berthed and will not leave port again for several weeks?
  • The GMDSS Radio Operator must notify the NCS that the vessel will be off-line, and wait for the NCS to acknowledge with a confirmation number that must be logged.
  • The Inmarsat-C system can be powered down without taking additional steps once the GMDSS Radio Operator has ensured that all incoming SafetyNETTM messages have been received and stored.
  • Correct Answer
    The GMDSS Radio Operator may log out of the Inmarsat-C system and turn the power off (unless the vessel decides to leave the unit on during the port stay.)
  • The GMDSS Radio Operator must transmit an all-ships alert, to notify vessels within the satellite's footprint that the vessel will be off-line.
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What action should always be taken before powering down an Inmarsat-C terminal or leaving one satellite footprint for another?
  • An Inmarsat-C system must never be powered down or mandatory MSI messages will be lost.
  • Send a message to the NCS advising arrival in port or request the NCS log your terminal in with the new satellite.
  • No action is required -- the terminal will automatically log in with the new satellite when the NCS common channel is detected or after power up.
  • Correct Answer
    Log out with the current NCS to inform them you are off the air or to enable a proper log in procedure with the new satellite.
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With most Inmarsat-C systems what should the indicator lamps do when powering up?
  • Correct Answer
    All lamps should illuminate in a particular sequence, as per the operator's manual.
  • The power on lamp should illuminate. Other lights remain off until a message is received.
  • All lamps should light and stay illuminated.
  • All lamps should light except the RED light.
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What is the importance of a successful log in indication, after power-up, on an Inmarsat-C terminal?
  • The antenna Azimuth and Elevation controls are correctly adjusted.
  • Correct Answer
    The terminal is enabled for routine incoming and outbound traffic.
  • The receiver gain is properly adjusted for maximum signal.
  • Unscheduled EGC MSI messages can no longer be received.
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On an Inmarsat-C system, what is the importance of a successful "SYNC" indication after power up?
  • The system is not yet locked on to the NCS signal until a log-in command is performed.
  • Correct Answer
    Sufficient signal strength on the NCS common channel is being received.
  • There is company telex traffic being received on the NCS common channel.
  • The NCS has confirmed log-in status is on so routine traffic can be sent and received.
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On an Inmarsat-C system an incoming EGC alarm sounds:
  • When first powered on and when receiving Distress traffic.
  • When receiving Distress traffic and all of the BALD MSI messages.
  • Correct Answer
    To draw the operator's attention to an unscheduled Distress or Urgency message.
  • To indicate the loss of NCS CC sync -- preventing the reception of unscheduled EGC messages.
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