Legacy C Software and the World Magnetic Model (WMM) Coefficients with executables for Windows and Linux.
Access
Maps
Each PDF includes 45 maps of the magnetic elements and their secular variation.
Note: This heritage software takes height ABOVE ELLIPSOID as user input. Note that the new WMM software allows heights to be specified above ellipsoid or above mean sea level. For comparisons between the old and new software, please make sure to use the same height option.