The Earth’s Magnetic Field Declination from 1590 to 1990
sourced from Wikipedia http://en.wikipedia.org/wiki/File:Earth_Magnetic_Field_Declination_from_1590_to_1990.gif and originally from the U.S. Geological Survey http://geomag.usgs.gov/movies/movies/index.php?type=declination&format=gif [!sigh! broken link]