Geophysical professional magnetic method program, the program can be calculated according to the latest spherical harmonic coefficients for normal field values ​ ​ for any latitude and longitude on Earth.

Geomag61_windows\geomag.exe
................\geomag61.c
................\IGRF10.cof
................\README.txt
................\sample_coords.txt
................\sample_out_IGRF10.txt
................\sample_out_WMM2005.txt
................\WMM2005.cof
Geomag61_windows

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