Case 1 for GNAV two “random” points: A and B are on the same meridian


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Calculating tracks and distances between two not so random points

Welcome back!
So now that you know that these questions are not random at all but specifically crafted for the ATPL exam-database it is time to show you the system.

To start your analysis, ask yourself:

Question 1:
Are A and B on the same meridian?


A: 40N 120E
B: 10N 120E

–> Yes. They are on the same meridian because they have the same longitude (120E).


– Great Circle distance = Change of latitude x 60 NM (Dis = chLAT x 60)
– The track from A to B is either 360 or 180 via the meridian.

Remember this one from the introduction?

Q4300 Oefenvragen track & distance
A flight is to be made from ‘A’ 49ºS 180ºE/W to ‘B’ 58ºS, 180ºE/W. The distance in kilometres from ‘A’ to ‘B’ is approximately:

A and B are on the meridian of 180 E/W.
They are 9 degrees apart (58S – 49S) = 9 x 60 = 540 nautical miles. –> D.
You answered C?
The question was how many kilometers…
And by the way, the track is 180.

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