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compass deflection

From Wiktionary, the free dictionary

English

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Noun

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compass deflection (plural compass deflections)

  1. The difference, expressed in degrees, between the direction a magnetic compass needle points and true or astronomical north; magnetic declination.
  2. Differences, expressed in degrees, between magnetic north directions and the direction a magnetic compass points, owing to local magnetic interferences; magnetic deviation.

References

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  • United States Bureau of Mines, Dictionary of Mining, Mineral, and Related Terms (1996).
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