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.

Questions 18

Time Limit 9 min

Language English

Sample Questions

Here are some example questions from this quiz. Download the GYRO app to take the full test.

Question 1

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.

Question 2

Why is Selective Availability no longer considered a significant factor in GPS accuracy?

A It was permanently discontinued in 2000.

B GPS receivers now use GLONASS.

C ECDIS automatically removes Selective Availability.

D AIS corrects GPS errors.

Question 3

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

A System accuracy decreases.

B System accuracy increases.

C System accuracy stabilizes.

D Signals are never deflected into multipath signals with GPS.

Question 4

What types of Global Navigation Satellite Systems (GNSS) receivers are used at sea for navigational purposes?

A Navstar GPS, GLONASS, and combined Navstar GPS and GLONASS, while other GNSS are under development.

B Only Navstar GPS.

C Only the Global Positioning System.

D Combined Navstar GPS and Decca navigator receivers.

Question 5

In the Navstar GPS system, satellites orbit the earth in approximately:

A 12 hours.

B 3 hours.

C 6 hours.

D 24 hours.

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