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All over the world, airport runways are marked with a couple of digits from 01 to 36. This marking corresponds to the magnetic course which runways are located on and helps pilots operate the plane safely. In order to identify the course indicator, the magnetic course is rounded to tens and divided by 10.
For example, a runway has the magnetic course 77°, then on the runway, it will be indicated with the numbers 08. And since any runway has 2 directions and the difference between them is 180°, the other side of the runway will be indicated with numbers 26 (08+18=26).
The zero direction is replaced by the course 360° and is marked with the number 36.
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