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how i calculate magnetic heading from magnetic trac eg: tas 290 and wc -8

Asked by: 4601 views Commercial Pilot, Flight Instructor


 how i calculate magnetic heading from magnetic trac eg: tas 290 and wc -8

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1 Answers

  1. DC on Jan 19, 2012

    I’m not entirely certain what you mean by “magnetic trac”, but I’ll try to answer your question. Here’s the general formula for figuring out which to fly to get from point A to point B:
    TC ± WCA = TH ± VAR = MH ± DEV = CH

    TC (true course): You obtained this by drawing a line on your chart and using a plotter to determine the true course.
    WCA (wind correction angle): You obtained this by checking winds aloft at your planned altitude and using a computer (e.g., an E6-B) determined this value.
    Now you have the TH (true heading).
    VAR (magnetic variation): You obtain this by looking on your chart for the isogonic lines (purple dashed line) closest to your route of flight. These lines are labelled with a number to gives the difference between true and magnetic north in that region. If the variation is easterly (E) you SUBTRACT the value, if it’s westerly (W) you ADD the value to your TH.
    Now you have MH (magentic heading).
    DEV (deviation): You obtain this by looking at the compass deviation card in your aircraft and applying the correction closest to your MH.
    Now you have CH (compass heading). Take off, turn to this heading, and you’ll get from point A to point B (assuming the winds don’t change enroute).


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