Compass-deflection Definition
noun
The difference, expressed in degrees, between the direction a magnetic compass needle points and true or astronomical north; magnetic declination.
Wiktionary
Differences, expressed in degrees, between magnetic north directions and the direction a magnetic compass points, owing to local magnetic interferences; magnetic deviation.
Wiktionary
Other Word Forms of Compass-deflection
Noun
Singular:
compass-deflection
Plural:
compass deflections
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