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https://www.patana.ac.th/secondary/science/anrophysics/ntopic6/images/magnetic_field_earth.jpg
4. World Magnetic Model (2010).
http://ngdc.noaa.gov/geomag/WMM/
5. Titterton, D., Weston, J.: Strapdown Inertial Navigation Technology. Institution of Electrical Engineers, Stevenage (2004)