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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


Browse imagery and contour maps for main field and secular change

Uses of WMM

Common applications of WMM


License and copyright information

This website is being retired. Please check out our new website here https://www.ncei.noaa.gov/products/world-magnetic-model

Maps of Magnetic Elements from the WMM2020

Contour maps were created for each of the seven magnetic elements (D, I, H, X, Y, Z, and F) and for their secular variation (rate of change). These maps are available for download in pdf format by clicking on the browse images below or you can download a zip file containing all of the map pdfs with or without the blackout zones. You can view and print the maps using the Adobe® Reader® (available for free from the Adobe website.) NOAA Disclaimer for external links. The maps are also available for download in the ESRI Shapefile format . A detailed description of the file format is given in the Esri Shapefile Technical Description.

Map Download Options:

All component maps with blackout zone zip file
All component maps without blackout zone zip file
Maps and ESRI Shapefiles of all the components (geographic and polar stereographic projections) and blackout zones for years 2020 through 2025 are available via our Web accessible folder
Miller Projection
Main Field
Miller Projection
Secular Variation
Polar Stereographic
Arctic Main Field
Polar Stereographic
Antarctic Main Field

Other Magnetic Maps:

Miscellaneous magnetic field component maps and figures.
Change in Declination
over 10 years
(WMM2020 - WMM2010)
Declination and Secular Variation
over North America
Declination and Secular Variation
over Alaska