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DGPS

CBT 59 questions

First 5 of 59 questions — with answers

The correct answer is marked. Unlock the rest to study the whole test, online or offline.

  1. Question 1

    Are the GPS satellites fitted with any accurate clocks?
    • Yes, 4 atomic clocks.
    • 2 quarts clocks.
    • Yes, 4 clocks powered by atomic energy.
    • No, the time comes from the ground stations.

  2. Question 2

    GLONASS is an alternative to what system?
    • Navstar GPS.
    • Receiver for Navstar GPS.
    • e-Loran.
    • Satellite Tracking Stations.

  3. Question 3

    Global Navigation Satellite Systems (GNSS) provides three services known collectively as PNT, what are they?
    • Position, Navigation and Timing.
    • Position, Navigation Data and Time.
    • Precision, Navigation and Time.
    • Position, Nautical and Terrestrial.

  4. Question 4

    How can the adverse effects of the ionosphere and troposphere be minimized?
    • The effects of the ionosphere and troposphere can be reduced by not using the data from satellites below a certain altitude.
    • There is no method available to reduce the effects of the ionosphere and troposphere.
    • The effects of the ionosphere and troposphere can be reduced by not using the pseudo random signals from the satellites.
    • The effects of the ionosphere and troposphere can be reduced by only using bearings of the satellites and not ranges to fix the ship's position.

  5. Question 5

    How does the Differential GPS improve the accuracy of the output position?
    • The position from the Navstar GPS produced by the receiver is compared with a e-Loran signal to improve the accuracy of the ship's position.
    • The two satellite signals L1 and L2 are received by the ship and the difference between the two signals produces a correction factor to the position output.
    • A combination of signals from the Navstar GPS satellites are sent to the ship's receiver and compared to provide a more accurate position output.
    • An error of position message is provided by a differential reference station and sent to the ship.

Preview — 5 of 59 questions

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About this CBT test

DGPS is a CBT test with 59 questions and verified answers. Common topics include: reference navstar, latitude longitude, global navigation, satellite systems, output position, gps, system, satellites.

You can practise the free questions online — one at a time, with the correct answer — or unlock the whole test and download it to study offline, without internet.

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