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compass error[′käm·pəs ‚er·ər]
The angle by which a compass direction differs from the true geographical direction; assuming that there is no lubber line error, it is the algebraic sum of the declination, variation, and motion errors.
The algebraic sum of deviation and variation. Easterly deviations and variations are given a “+” sign, while westerly deviation and variation are given a “−” sign.