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Subel. D
6 questions
Subelement D

Other GMDSS Equipment:

Section 36

Navtex:

Which of the following is the primary frequency that is used exclusively for NAVTEX broadcasts internationally?

  • 490 kHz
  • Correct Answer
    518 kHz
  • 2187.5 kHz
  • 4209.5 kHz
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The NAVTEX is powering on and appears to be functioning normally except there have been no new messages for an extended period. The station settings are correct. What is the most likely source of the problem?

  • The audio amplifier is defective.
  • The wrong frequency has been selected.
  • Correct Answer
    The RF amplifier at the antenna base is defective.
  • The DC supply voltage is too low.
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How is a NAVTEX receiver programmed to reject certain messages?

  • The transmitting station's two-digit identification can be entered to de-select reception of its broadcasts.
  • By entering the SELCALL of the transmitting station.
  • By pressing "00" in the transmitter's ID block.
  • Correct Answer
    By choosing a message category's single letter (A-Z) identifier and then deselecting or deactivating.
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How can reception of certain NAVTEX broadcasts be prevented?

  • Correct Answer
    The receiver can be programmed to reject certain stations and message categories.
  • Stations are limited to daytime operation only.
  • Coordinating reception with published broadcast schedules.
  • Automatic receiver desensitization during night hours.
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How is accuracy insured in NAVTEX broadcasts?

  • A parity check character is sent at the end of each line.
  • Each message is retransmitted.
  • Selective FEC is used to prevent errors.
  • Correct Answer
    Each character is sent twice with a time interval.
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NAVTEX broadcasts are sent:

  • Correct Answer
    In categories of messages indicated by a single letter or identifier.
  • Immediately following traffic lists.
  • On request of maritime mobile stations.
  • Regularly, after the radiotelephone silent periods.
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