Magnetic variation (MVAR, MAGVAR).
Difference between true north and magnetic north, varying with position; magnetic variation drifts with time; Symbols: nu; Typical Units: rad, deg;
MAGVAR.
Magnetic variation ...
The difference between the magnetic direction and the true direction is called the magnetic variation. All aeronautical charts show the magnetic variation.
Here is how you can ascertain the VOR twist: The first step is to obtain the actual magnetic variation in your area. Often the easiest way is to look through the Airport/Facility Directory13 and find a nearby airport that has been recently surveyed.
reading from a magnetic compass refers to compass north (4), which is supposed to contain a two-part compass error:
a) The earth's magnetic field's north direction, or magnetic north (3), almost always differs from true north by magnetic variation ...
Isogonic lines. Lines drawn across aeronautical charts to connect points having the same magnetic variation.
IVSI. See instantaneous vertical speed indicator.
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Agonic line. An irregular imaginary line across the surface of the Earth along which the magnetic and geographic poles are in alignment, and along which there is no magnetic variation.
Related Definitions from Aviation Glossary ...
Fill out checkpoints
Measure and enter true course
Determine and enter magnetic variation
Measure and enter distances between checkpoints
Fill out distance remaining box
Calculate total distance ...
 See also: Aircraft, Navigation, Direct, Speed, Flight
  
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