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What are pickup covers for?

Everyone knows they are there to counteract the magnetic forces caused by the rotation of the earth, which can effect your tone. The closer you live to the equator, the more effect.
Sorry to have to correct you here, but you're exactly half right! For those in the eastern hemisphere, it's exactly the opposite of those in the western hemisphere. In the eastern hemisphere, for example, the pickup covers actually work WITH the magnetic forces caused by the rotation of the earth, thereby NOT affecting your tone. In the western hemisphere, though, you're absolutely correct.