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Old April 26, 2013, 10:20 AM   #16
Major Dave (retired)
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Join Date: March 12, 2008
Location: Between Dallas and Shreveport, LA
Posts: 569
Another comment

While I realize you put the two compasses within an inch or so of each other so we could see the reverse polarity, they should be separated by 5 meters when checking one against another. This is so because each needle is magnetized, and the magnetic field of one will interact with the magnetic field of the other, causing both to be inaccurate, even when the polarity is not reversed.
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