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The distance between the departure and the arrival aerodrome is 100 NM. After 20 NM the aircraft is 5 NM left off the planned track. The track error angle (TKE) equals to…

  • A

    36°

  • B

    12°

  • C

    15°

  • D

    22°

Refer to figure.
The track you want to fly is the planned track, and the track you actually make over the ground is the track made good. The difference between them is called track error (TE).

Using your Flight/Nav computer, the track error angle (TKE) is:

  • Align distance off, 5 NM (50) outer scale, with distance travelled, 20 NM inner scale. Above the black arrow (60), read the degrees to parallel: 15° on the outer scale.

An alternative way to calculate the course change to reach B directly based on the 1:60 rule, which states that: "For each degree of track error you will be one NM off-track having travelled 60 NM along track" is:

  • TKE = (Distance off track x 60) / Miles travelled = (5 NM x 60) / 20 NM = 15°.

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