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CD0059. DGPS

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About this collection

The Seagull CBT bank is organised into modules covering safety, shipboard operations, maintenance and other topics. Original module names and codes are retained to help you find the topic you need.

“Seagull CBT — CD0059. DGPS” contains 58 questions across 1 collection.

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Sample questions and answers

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When considering GPS, what is the result of receiving multipath signals?

One correct answer

  • System accuracy increases.
  • System accuracy stabilizes.
  • System accuracy decreases.✓ Correct answer
  • Signals are never deflected into multipath signals with GPS.
What is the pseudo-random code with reference to The Navstar GPS?

One correct answer

  • The complicated digital code sent from the satellite and mirrored by the GPS receiver.✓ Correct answer
  • The code sent by the tracking stations to the satellites.
  • The complicated code sent by the satellite which is decoded by the GPS receiver to measure the range.
  • The complicated code which is transmitted at random intervals by the satellite.
When considering Navstar GPS, what is the name of the common error affecting the orbital satellite position information?

One correct answer

  • Fluxgate error
  • Ephemeris error✓ Correct answer
  • Kalman error
  • Ionosphere error
With reference to the Navstar GPS, what is the significance of the “pseudo-random code” of the satellite transmissions

One correct answer

  • The signal is so complicated that it almost looks like random electrical noise✓ Correct answer
  • The transmitted signal from the satellite changes content randomly to avoid being duplicated.
  • The transmitted signal from the satellite changes frequency randomly to reduce the ionospheric interference
  • The satellite send a false signal prior to the correct signal to reduce the possibility of spoofing
When considering Navstar GPS, which coordinate system (datum) is recommended to be used at all times?

One correct answer

  • WGS-84✓ Correct answer
  • ED-50
  • NAD-27
  • NAD-83

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