ATPL NAV revision test 3

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In a vertical axis gyro at the south pole-
(a) drift and topple due to the earths rotation will be at max values.

(b) drift and topple due to the earths rotation will be at zero.

(c) drift will be zero and topple will be max

(d) drift will be maximum and topple will be zero.

(b)
In a horizontal axis gyro at the south pole the drift and topple will be ?

Drift will be max and topple will be zero.
The min number of satellites required to eliminate gps clock error is ?

4 sats
The most significant gps error is caused by?

the ionosphere.
the minimum number of gps sats needed for accurate 3d gps fix is ?

4
The use of pseudo random code allows each satellite to ?

Transmit on the same frequency.
The GPS error called GDOP or PDOP is caused by?

A small distance between satellites.
GPS works on the principle of-

time difference.
The GPS pseudo-random code allows for-

Low power operations.
Which out of the two has a higher frequency, the C/A or the P code

The C/A code civil
GPS receivers can reduce the magnitude of GDOP error by?

by selecting the 4 best spaced satellites.
In relation to the the background noise a GPS signal is ?

Weaker.