Bridge Navigation & Deck Operations

DGPS / GNSS Navigation Systems

Test your knowledge of modern satellite navigation systems .This quiz covers GPS, DGPS and GNSS fundamentals, including positioning accuracy, satellite signals, common errors, RAIM, HDOP, chart datums, and safe navigation practices. Designed for cadets, deck officers and maritime professionals.

Питань 18

Час 9 min

Мова Англійська

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Питання 1

With reference to a standard ships Navstar GPS receiver, how would the probable accuracy of the output position be indicated?

A HDOP.

B Probability in metres.

C Probability in cables.

D Probability in decimals of a nautical mile.

Питання 2

It is commonly recognised, that the Navstar GPS system consists of three main segments. What are these segments?

A Space, Control and User segment.

B Latitude, Longitude and Time.

C Satellite, Signal and Receiver.

D Position, course and speed.

Питання 3

How the Officer of the Watch must act, when the Navstar GPS receiver is set to provide an output position of latitude and longitude which is different to the datum on the paper chart?

A Apply the corrections marked on the chart before plotting the latitude and longitude.

B Change the datum used by the GPS receiver to the same datum as used on the chart.

C There will be very little difference between the two datum’s and it can be ignored.

D Plot the output latitude and longitude and insert warning note on the chart of possible inaccuracies.

Питання 4

With reference to Navstar GPS system used in conjunction with a Differential Reference Station, on what is the accuracy of the resultant position mainly dependant?

A The distance between the observer and the reference station.

B The relative angle between the satellites.

C The number of satellites available.

D The price of the equipment.

Питання 5

When considering Navstar GPS, what is the name of the common error, affecting the orbital satellite position information?

A Ephemeris error.

B Fluxgate error.

C Kalman error.

D Ionosphere error.

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