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Subel. C
6 questions
Subelement C
Satellite Systems:
Section 25
Long Range Identity Tracking:
The U.S. National Data Center that monitors polling input for each US Flag ship:
  • Correct Answer
    Must receive at least 4 position reports daily.
  • Must receive LRIT position reports each hour.
  • Must receive at least 1 position report daily including the number of crew aboard.
  • Is a double check on AIS output.
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LRIT Long Range Information Tracking data:
  • Need not be transmitted if AMVER daily messages are sent.
  • Correct Answer
    Is a separate tracking system for each flag state's security.
  • Is shared for the Captain of the Port.
  • Is broadcast on the Internet for company tracking purposes.
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LRIT Long Range Information Tracking: 
  • Can serve as duplicate back up information for AIS (Automatic Information System.)
  • Works on the same frequencies as AIS, but on different channels.
  • Correct Answer
    is detected on the Inmarsat-C satellite network.
  • Puts out a polling signal on the Inmarsat B system.
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When a compulsory equipped IMO ship is not correctly broadcasting LRIT Info what action should be taken?
  • Check the power fuse on the Sat D box located on the bridge.
  • Can re-boot the AIS broadcasting unit.
  • Verify the Ship Security Alerting System has not been accidentally activated.
  • Correct Answer
    Double check the GMDSS Console's Inmarsat-C terminal for regular operation.
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What must a LRIT terminal do?
  • Correct Answer
    Capable of being configured to automatically transmit an APR, transmit an APR every 6 hours, be able to automatically transmit a PR if requested.
  • Capable of being configured to automatically transmit an APR, transmit an APR every 12 hours, be able to automatically transmit a PR if requested.
  • Capable of being configured to automatically receive an APR, transmit an APR every 8 hours, be able to automatically transmit a PR if requested.
  • Capable of being configured to automatically receive an APR, transmit an APR every 24 hours, be able to automatically transmit a PR if requested.
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What satellite system does not support LRIT?
  • Inmarsat-C
  • Correct Answer
    GPS
  • IRIDIUM
  • Inmarsat-D+
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