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Also known as "degaussing," which brings me back to my school days when I would sometimes degauss the school's CRT monitors when I got bored just for fun. Looks like this, if you didn't live through those times: https://www.youtube.com/watch?v=Sd9nOtX-CJg

There was a lot more ripple if the refresh rate was set higher but the degausser still ran at 60Hz.

Yeah, it made a very satisfying noise and visual effect.

Also: https://en.wikipedia.org/wiki/Magnetic_deviation

Quick idea: rotate the ship 360 degrees, integrating the magnetic forces. What remains is the magnetic force of the ship itself. In subsequent measurements, subtract this magnetic force to get the component of the magnetic field of the Earth.

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