compass deflection (English, noun)
expansion: compass deflection (plural compass deflections)
Senses:
glosses: The difference, expressed in degrees, between the direction a magnetic compass needle points and true or astronomical north; magnetic declination.
glosses: Differences, expressed in degrees, between magnetic north directions and the direction a magnetic compass points, owing to local magnetic interferences; magnetic deviation.
Forms:
form: compass deflections
tags: plural