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Brief description of geomagnetism

About WMM

Main field model development, accuracy and limitations

Model & Software

Main field, model development, accuracy and test values

Online Calculators

Web-calulators for main field


Browse imagery and contour maps for main field and secular change

Uses of WMM

Common applications of WMM


License and copyright information

World Magnetic Model - Old reports

The previous technical reports can be downloaded here

WMM 2005 report (PDF 9 MB)

WMM 2000 report (PDF 200 KB), UK version, with maps (PDF 10 MB)

WMM 1995 report (PDF 200 KB)


Because WMM is a "predictive only" model, we do not make the older models (WMM.COF files) widely available. We recommend to make use of the International Geomagnetic Reference Field ( IGRF) models for years prior to 2010. IGRF is updated retrospectively to provide the best available estimate of the geomagnetic field back to 1900.

Last Modified on: Monday, 05-Nov-2012 15:30:15 MST
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