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Direct Reading Compass - Turning Error

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  • Direct Reading Compass - Turning Error

    Notes 4.7 (v6.1.3) & ATP Digital 12 Page 10

    For the question attached, the aircraft is in the Northern hemisphere and turning South.

    According to the notes, the compass leads the aircraft's real heading. With the CAA quoting of 20 degrees for turning error in the mid lattitudes, this would suggest that:

    - When the compass reads 160 degrees, the aircraft heading would be 140 degrees.

    - When the compass reads 200 degrees, the aircraft heading would be 180 degrees

    Have I misinterpreted the notes?
    Attached Files

  • #2
    Re: Direct Reading Compass - Turning Error

    I think the problem lies in the meanings of "lead" and "lag". If you are turning from W through S your heading is reducing numerically and "lead" means the indicated heading is less numerically than the true heading. Going the other way, turning right through S "lead" means the numbers are bigger

    Dick

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    • #3
      Re: Direct Reading Compass - Turning Error

      Got you! Just re-looked at it and delete maths, insert compass rose (and brain) and it became apparent.

      Note to self - don't do compass / gyro theory at the end of a study day!

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