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Background

Brief description of geomagnetism and observation systems

About WMM

Learn more about model derivation, uncertainties and magnetic poles

Model & Software

Download model coefficients, software and documentation

Online Calculators

Calculate magnetic field values at or near the Earth surface

Maps

Browse imagery and contour maps for main field and secular change

Uses of WMM

Common applications of WMM

License

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, 2019.

WMM2015 Is Released!

Download WMM2015 Model and Software

Use latest WMM in the Magnetic Field Calculators

Please contact geomag.models@noaa.gov for comments or questions.
WMM2015 report will be made available in January 2015


NOAA Press Release | NESDIS: Navigating the world just got easier...

WMM 2015 Declination Map

WMM 2015 Declination Map

WMM 2015 Total Intensity Map

WMM 2015 Total Intensity Map

Metadata for WMM


Last Modified on: Monday, 15-Dec-2014 12:42:42 MST
NOAA > NESDIS > NGDC
http://www.ngdc.noaa.gov/geomag/WMM/DoDWMM.shtml
Maintained by: geomag.models@noaa.gov