Compass Dip Needle Calibration

dip needle

Compass Dip needle calibration notes: A good dip needle can be used to a degree to indicate resulting latitude after the coming pole shift. It can also aid in finding of minerals and/or migration movement towards warmer environments.
1) How does one calibrate a dip needle in a primitive environment? Whether home made or
store bought, or used they most probably will need some calibration.
2) How does one properly use a dip needle?
3) How does one tell if one is working properly?

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