What is magnetic variation, and how can I find the magnetic variation for a particular point?
Check out the National Geophysical Data Center’s (NGDC) Geomagnetic Field Synthesis Program (Version 3.0), or GEOMAG, to locate the magnetic variation for any given point. Simply provide the date(s), elevation if known, and location (latitude and longitude). You may need to consult a resource like the World Almanac to locate the location information—elevation, latitude and longitude are all provided. The GEOMAG model will compute the values of the Earth’s magnetic field parameters. For additional information on magnetism, please refer to the Geomagnetic FAQs prepared by the NOAA National Geophysical Data Center’s World Data Centre-A (WDC-A) for Solid Earth Geophysics in Boulder, Colorado.
