OGRAD 09.03 - DECCA Navigation System ( ATPL Only)

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Q1. Which of the following statements most correctly describes the Decca navigation system?

It is a short range (100-200 NM) pulsed radar navigation system

It is a long range (over 1000 NM) hyperbolic navigation system

It is a world wide navigation system based on geostationery satellites

It is a medium range (200-300 NM) constant wave hyperbolic navigation system

Q2. In which frequency band does the Decca navigation system operate?

VLF

Q3. In relation to Decca ground transmitters, hyperbolic position lines are lines on which all points will always have the same:

difference in range from both

range from both

phase angle from both signals

difference in signal amplitude from both

difference in range from both

Q4. Which of the following statements accurately describes the availability of Decca navigation system coverage?

It is only available in Europe where it is confined to areas of the North Sea

It is limited to Europe and parts of Africa

It is limited to very specific local areas of Europe and the Middle East

It is available throughout the world without restriction

It is limited to very specific local areas of Europe and the Middle East

Q5. DECCA is

A long range hyperbolic navigation system, based on measuring the phase difference of carrier waves

Is a low frequency hyperbolic navigation system, being very accurate and based on measuring the difference in time of arrival of two pulses, one from a master and the other from a slave station.

Using airborne equipment measuring phase difference between two received carrier waves, and is operating at Medium frequencies

A short range hyperbolic navigation system, operating at Low frequencies

Q6. What is the normal range of accurate fixing using Decca by day?

400 NM

100 NM

200 NM

300 NM

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