magnetic variation


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Related to magnetic variation: Magnetic deviation

magnetic variation

[mag′ned·ik ‚ver·ē′ā·shən]
(geophysics)
Small changes in the earth's magnetic field in time and space.

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.
References in periodicals archive ?
The licensed technology, which complements Quantum's passive magnetic sensor technology and expertise, involves the use of a three-sensor gradiometer to measure minute magnetic variations caused by ferromagnetic objects at room temperature.