THE existence of compass errors on ships resulting from the presence of masses of iron in the vicinity of the compass and the method of compensating such errors have been known for over a century. In aircraft the problem is essentially similar, but an additional complication arises where there are moving masses in close proximity to the compass, as the effect of such masses in distorting the Earth's magnetic field depends on their position and therefore cannot be adequately compensated by the usual methods.
Hadekel, R. (1940), "Non‐Magnetic Materials for Aircraft: A Survey of Some of the Metals Available for Such Parts as Controls, Nose‐Wheels, etc.", Aircraft Engineering and Aerospace Technology, Vol. 12 No. 1, pp. 15-15. https://doi.org/10.1108/eb030595
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