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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

National Geospatial-Intelligence Agency.

The World Magnetic Model

The World Magnetic Model is a joint product of the United States’ National Geospatial-Intelligence Agency (NGA) and the United Kingdom’s Defence Geographic Centre (DGC). The WMM was developed jointly by the National Geophysical Data Center (NGDC, Boulder CO, USA) and the British Geological Survey (BGS, Edinburgh, Scotland).

The World Magnetic Model is the standard model used by the U.S. Department of Defense, the U.K. Ministry of Defence, the North Atlantic Treaty Organization (NATO) and the International Hydrographic Organization (IHO), for navigation, attitude and heading referencing systems using the geomagnetic field. It is also used widely in civilian navigation and heading systems. The model, associated software, and documentation are distributed by NGDC on behalf of NGA. The model is produced at 5-year intervals, with the current model expiring on December 31, 2014.

The new model, WMM2015, will available from this web site on December 15, 2014.
Please contact with any comments or questions.

Download WMM2010 Model and Software

WMM 2010 Declination Map WMM 2010 Total Intensity Map

How to Cite These Data:

Maus, S., S. Macmillan, S. McLean, B. Hamilton, A. Thomson, M. Nair, and C. Rollins, 2010, The US/UK World Magnetic Model for 2010-2015, NOAA Technical Report NESDIS/NGDC.

Metadata for WMM

Last Modified on: Thursday, 25-Sep-2014 09:22:38 MDT
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