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Magnetic Compass - QT

Updated: Apr 26, 2021

Lesson Quicktakes cover the items that should be memorized from each of the wifiCFI Lessons. They do not cover all of the lesson details in-depth.


COMPASS ERRORS (VDMONA):

  • V = Variation.

  • D = Deviation.

  • M = Magnetic Dip.

  • O = Oscillation.

  • N = Northerly Turning Errors.

  • A = Acceleration Errors.


VARIATION:

  • The angular difference between True and Magnetic North.


DEVIATION:

  • Caused by the Electro-Magnetic Fields of the aircraft.

  • Corrected with a Compass Deviation Card.


MAGNETIC DIP:

  • The further a compass travels North or South the more it dips toward the North or South Pole.


OSCILLATION:

  • Turbulence causes the compass to bounce around in its housing of fluid.


NORTHERLY TURNING ERRORS (UNOS):

  • Undershoot

  • North

  • Overshoot

  • South


ACCELERATIONS ERRORS (ANDS):

  • Accelerate

  • North

  • Decelerate

  • South

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