BBC Midlands Today a few days ago featured a company making compasses. They showed amongst other things a sort of "Calibration Room" - a master compass used to check the accuracy of new compasses being made. It was built exclusively of non-ferrous material and other protective measures designed to exclude local conditions as far as possible from affecting the way the master compass works.
The Master Compass maker said that, despite all this, the measured position of North still varies, even on a daily basis, depending on a range of conditions including temperature and pressure.
There's no true value of anything!
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