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From How Stuff Works:

Magnetic declinations vary from place to place, depending on the intensity of the Earth's magnetic fields. For instance, if you hold out a compass in New Zealand, magnetic north will be about 20 degrees east of true north, whereas the declination in Los Angeles is 12 degrees. Geographical lines do exist where true north and magnetic north are aligned, and these are called agonic lines. In North America, one currently runs through the panhandle of Florida up to the Great Lakes and into the Arctic Ocean.

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