GEOMAGNETIC MAPS (dish size list or tuning page)
(to Western Hemisphere,Eastern Hemisphere,Footprints by Dish Size)

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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. North America, South America, Europe, 
Middle East, Orient/New Guinea, Australia/New Zealand, Global


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