B Does a Compass Point to Geographic South Below Earth's Surface?

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Magnetic field lines form closed loops, indicating that the field inside the Earth is influenced by geographic south. Compasses located below the Earth's surface will not point directly to geographic south due to the complexity of the magnetic field. The Earth's magnetic field is not a simple dipole; it involves various factors that affect its behavior underground. Understanding these complexities is crucial for interpreting compass readings in subterranean environments. The intricacies of the Earth's magnetic field challenge the assumption of straightforward compass navigation below the surface.
hackhard
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since magnetic field lines form closed loops , field inside Earth must be due geographic south
will compass below Earth's surface point to geographic south?
 
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The first figure on the Wikipedia page on the Earth's magnetic field should answer your question. The magnetic field inside the Earth is much more complicated than a dipole field.
 
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