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This question already has an answer here:

What is the meaning of the track info found on Flightradar24, as seen below?

Would be the angle between the route and the equator?

enter image description here

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marked as duplicate by fooot♦, vasin1987, SentryRaven, Steve V., Simon Feb 10 '15 at 7:34

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    $\begingroup$ I don't think this is a duplicate - FR24 doesn't quite follow normal aviation 'practice'. $\endgroup$ – jwoolard Feb 10 '15 at 0:23
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That is the angle between true north and the current ground track. FR24 is slightly different to (most) aviation in that it uses true north instead of magnetic north as the datum.

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Track is the heading the aircraft is actually tracking over the earth's surface. This is different from the heading that the aircraft is flying, as wind does change the directional component over the earths surface.

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