magnetic variation


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magnetic variation

[mag′ned·ik ‚ver·ē′ā·shən]
(geophysics)
Small changes in the earth's magnetic field in time and space.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

magnetic variation

magnetic variation
In navigation, at a given place and time, the horizontal angle between true north and magnetic north measured in degrees East (+) or West (−) according to whether magnetic north lies east or west of true north. The magnetic variation indicated on a map or a chart is not a fixed quantity but is subject to change. Magnetic variation is indicated by dashed lines on maps and charts. Most maps and charts indicate the rate of annual change of variation also.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
AIM 1-1-18 goes on to say that a properly functioning RNAV system with a current, accurate navigation database should still fly the correct ground track for any loaded instrument procedure, despite differences in magnetic course attributable to magnetic variation source.
The National Geophysical Data Center, a division of NOAA, is responsible for creating magnetic variation models for the U.S.
There are a couple of standard abnormalities in the application of magnetic variation for certified devices.
The GPS calculates the magnetic course by conjuring the great circle route based upon the lat/long value of two VORs, and then adds the local magnetic variation at the aircraft's present position.
T., "Magnetic variations associated with ocean waves and swell," Journal of Geophysical Research, Vol.
The term variometer is generally applied to any instrument that registers magnetic variations, whether it be changes in magnetic declination or any other component of the field, horizontal or vertical.
For example there is a facsimile reproduction of Bernacchi's South Polar Times article of May 1902, which bore the catchy title of "The ESCHENHAGEN MAGNETIC INSTRUMENTS and the MAGNETIC VARIATIONS and DISTURBANCES they record." This had characteristically wonderful illustrations by E.A.