Exam (elaborations)
GNAV ATPL QUESTIONS AND ANSWERS 100% CORRECT
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Exam of 2 pages for the course ATPL at ATPL (GNAV ATPL)
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GNAV ATPLHow is the shape of the earth? - answerThe earth is an oblate spheroid (It is slightly
pear shaped)
Which is less, the polar diameter og the equatorial diameter? - answerThe polar
diameter is 0,3% less than the equatorial diameter (43 km less)
Equatorial diameter 12,756 km and polar diameter 12,713 km
What is the circumference of the Earth? - answer21.600 NM (40.000km)
How is the earths axis inclined? - answerThe axis is inclined 23,5°to the axis of the
earths orbit around the sun, for most navigation purposes we can ingnore this inclination
Which direction does the Earth rotate? - answerFrom west to east
What are cardinal points? - answerNorth, East, South, West
What are quadrantal directions? - answerNorth east, South east, South west and north
west
If north is 000° (or 360°) what are east south and west? - answerEast is 090°south is
180°and west is 270°
What is true direction (T)? - answerWhen direction is measured from the north
geographic pole
What is a great circle? - answerA circle on the surface of earth whose centre and radius
are those of the earth itself, it is called great because a disc cut through the earth in the
plane of the great circle would have the largest area that can be achieved. The shortest
distance between two points on the earths surface is the shorter arc of the great circle
joining the two points
Which great circle is the plane at 90°to the axis of rotation of the earth (The polar axis) -
answerThe equator, it lies in an east-west direction and divides the earth equally into
two hemispheres, it is the datum for defining latitude on the earth
What are meridians? - answerMeridians are semi great circles joining the north and the
south poles, every great circle passing through the poles forms a meridian and its anti
meridian, the meridians cross the equator at 90°
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