Geomagnetic Maps

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The most important geomagnetic fact to remember, the earth’s
magnetic field is neither uniform, stationary, nor perfectly
aligned with the planet’s poles. True north can be determined
with a compass reading plus/minus (as appropriate) the location’s
magnetic deviation. Magnetic deviation (also called magnetic
declination, magnetic variation, or compass variation) is the
angle between the north compass (magnetic) heading and the heading
to true (geographic) north. For absolute accuracy, you can call
your local airport control tower to find the magnetic correction
value for your area; this value can also be found on local maps
though many maps ommit this value. The following maps are also
called isogonic maps.

 

 

 

 

 

 

 

 

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