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"If you are using a compass, make sure that you take into account the magnetic variation into your estimations.

That is, there is a variable difference between the magnetic and the geographical northern poles which causes significant deviations and errors in some cases of data-gathering for orientation purposes.

Aside from this fact, you should consider that ferrous materials contained in the soil near the place where you are attempting to use your compass can also cause deviations and compass errors.

In order to be sure that this is not the case, you should make measurements in various nearby places.

If your needle pints to a "different" point in every case, then it is likely that you are near a magnetic source and therefore, you should move away before attempting to use your compass again."

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