I think the magnetic pole moves all the time, and the polarity has reversed a few times in Earth's history.
http://en.wikipedia.org/wiki/North_Magnetic_Pole
As of 2005 it was located at approximately 
79.74° N 71.78° W, off the northwest coast of Greenland,[11] but it is now drifting away from North America and toward Siberia.
Over geological timescales, the orientation of Earth's magnetic field (and that of other planets) can flip over, so that magnetic north becomes magnetic south and vice versa – an event known as a geomagnetic reversal. The Earth's magnetic field has done this repeatedly throughout history. It is thought that reversals occur when the circulation of liquid nickel/iron in the Earth's outer core is disrupted and then reestablishes itself in the opposite direction. It is not known what causes these disruptions. Evidence of geomagnetic reversals can be seen at mid-ocean ridges where tectonic plates move apart and the sea bed is filled in with magma. As the magma seeps out of the mantle the magnetic particles contained within it are oriented in the direction of the magnetic field at the time the magma cools and solidifies.