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Subelement H
Maritime Safety Information (M.S.I.):
Section 51
Navtex-1: Operations:
How is mutual interference on 518 kHz among NAVTEX stations avoided?
  • All stations transmit at the same time but stations are limited to daytime operation only to reduce the radius of propagation.
  • Transmitter power is limited, station assignment codes are not shared by other NAVAREAS and stations alternate between daytime and nighttime operations.
  • Correct Answer
    Transmissions scheduled on a time-sharing basis, power limited and station assignment codes are geographically separated.
  • Station codes are not shared by other NAVAREAS, transmissions scheduled on a time-sharing basis and power is limited.
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When do NAVTEX broadcasts typically achieve maximum transmitting range?
  • Local noontime
  • Afternoon
  • Sunset
  • Correct Answer
    Middle of the night
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What should a GMDSS Radio Operator do if a NAVTEX warning message is received but it contains too many errors to be usable?
  • Correct Answer
    Do nothing. Vital NAVTEX messages will be repeated on the next scheduled broadcast.
  • Contact the NAVAREA coordinator and request a repeat broadcast.
  • Initiate a request for Category A, B, L and D messages.
  • Listen to appropriate VHF weather channel for repeat warnings.
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Which of these cannot happen when a paper model NAVTEX receiver runs out of paper?
  • The unit is unable to print messages and all subsequent MSI broadcasts may be missed until the paper is replaced.
  • Correct Answer
    The system will automatically change from receiving MSI by NAVTEX to receiving it by SafetyNETTM so that no messages will be lost.
  • It may give off either an audible and/or visual alarm.
  • MSI messages may be missed because the unit cannot print them out.
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Which of the following is the primary frequency that is used exclusively for NAVTEX broadcasts internationally?
  • 2187.5 kHz
  • Correct Answer
    518 kHz
  • 4209.5 kHz
  • VHF channel 16 when the vessel is sailing in Sea Area A1, and 2187.5 kHz when in Sea Area A2.
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What is the transmitting range of most NAVTEX stations?
  • Typically 50-100 nautical miles (90-180 km) from shore.
  • Typically upwards of 1000 nautical miles (1800 km) during the daytime.
  • Correct Answer
    Typically 200-400 nautical miles (360-720 km).
  • It is limited to line-of-sight or about 30 nautical miles (54 km).
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