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NAVTEX — Navigation B — Instruments, Mashit 30

11 questions on NAVTEX, from the Navigation B — Instruments exam of Mashit 30. Reception, frequencies, the transmitter network and message types. Every question is shown with its correct answer, as in the official question pool.

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Questions on NAVTEX

  1. How often is a NAVTEX broadcast received from a given coast station? Every 4 hours.
  2. What should you set up on the NAVTEX receiver before sailing? The "stations" and the types of message you want.
  3. Distress messages that appear in the output of a NAVTEX receiver: Come from coast stations and the regional administration of the NAVTEX transmitter, to increase the number of vessels that can give help.
  4. VITAL, IMPORTANT and ROUTINE are: The grades that classify NAVTEX messages by priority and content.
  5. On which frequency band does a NAVTEX receiver receive? MF.
  6. What do VITAL, IMPORTANT and ROUTINE messages refer to, and what do they mean? The grades that classify NAVTEX messages by priority and content.
  7. How many times, and for how long each time, does a NAVTEX station transmit in one day? Every 4 hours, for at most 10 minutes each time.
  8. Which messages can be transmitted from the vessel on a NAVTEX set? None of the above.
  9. How are messages delivered in the NAVTEX system? Through a worldwide network of administrations and transmitters that broadcast safety information to shipping; vessels receive the information in printed form on dedicated receivers called NAVTEX receivers.
  10. How is the chain of NAVTEX transmitters that broadcast safety information laid out? So that within each transmitter's designed range (about 400 miles) there is no interfering overlap with the transmitter covering the neighbouring area (about 800 miles), while neighbouring administrations coordinate power and broadcasts.
  11. How do distress messages appear in the output of a NAVTEX receiver? They come from coast stations and the regional administration of the NAVTEX transmitter, to increase the number of vessels that can give help.

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