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Magnetic models for use with GeographicLib

These files give the data for various geomagnetic models. It's necessary to download and install at least one of these files if you want to use the MagneticModel class in GeographicLib.

The data is provided either as a compressed tar (extension .tar.bz2), a zip file, or a windows installer (extension .exe). If you're unsure which one to install, start with

wmm2025

For more information, see

https://geographiclib.sourceforge.io/C++/doc/magnetic.html#magneticinst