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Let's look at an example:

You are on a flight after 20 NM and have gone 1 NM off course. How many

degrees are you OFF Track?

To calculate this, you need to find out how many NM you are OFF Track when
you pass 60 NM. A little mental math will mean that if it was 1 NM at 20 NM,

then it is 2 NM at 40 NM and 3 NM at 60 NM. So, after 60 NM you will be 3 NM

OFF Track. This corresponds to having flown 3° too far to the left.

Task:

You are at A.

Calculate how many degrees you need to

change course to the right to accurately hit
B.

Solution:

o
You were 3 to the left of the planned course.
If you correct 3° degrees, you will fly parallel to the planned track.

When you start your correction, you are at 20 NM, and you are 1 NM OFF

track.

So, you have 40 NM to 60 NM. That is, you have 40 NM to go 1 NM to the
right. This corresponds to the fact that at 60 there are 60/40 = 1.5 NM.

So, you have to go another 1.5° to the right. So, you have to make a correction

o
o
of 3 + 1.5 = 4.5° to the right.

The picture here shows that

when we go 60 horizontally from

o
A (i.e. after a correction of 3 ),
the distance down to the blue

dotted line will be 1.5 NM, i.e. 1.5°.

Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 913