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Dataset Overview | National Centers for Environmental Information (NCEI)

World Magnetic Model 2025

browse graphicDeclination contour map in miller projection
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 is produced at 5-year intervals, with the current model expiring on December 31, 2029. The current model WMM2025 is produced jointly by the NCEI and the British Geological Survey (BGS). The model, associated software, and documentation are distributed by NCEI on behalf of US National Geospatial-Intelligence Agency and by BGS on behalf of UK Defence Geographic Centre.
  • Cite as: NOAA NCEI Geomagnetic Modeling Team; British Geological Survey. 2024: World Magnetic Model 2025. NOAA National Centers for Environmental Information. https://doi.org/10.25921/aqfd-sd83. Accessed [date].
gov.noaa.ngdc:WMM2025
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Distribution Formats
    Ordering Instructions Contact NCEI for other distribution options and instructions.
    Distributor NOAA National Centers for Environmental Information
    ncei.info@noaa.gov
    Dataset Point of Contact NOAA National Centers for Environmental Information
    ncei.info@noaa.gov
    Dataset Point of Contact NCEI Geomagnetic Modeling Team
    NOAA National Centers for Environmental Information
    geomag.models@noaa.gov
    Time Period 2025-01-01 to 2029-12-31
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Bounding Box Coordinates
    West: -180
    East: 180
    South: -90
    North: 90
    Spatial Coverage Map
    General Documentation
    Publication Dates
    • publication: 2024-12-17
    Edition 1
    Data Presentation Form mapDigital
    Dataset Progress Status Complete - production of the data has been completed
    Historical archive - data has been stored in an offline storage facility
    Data Update Frequency As needed - Associated WMM2025 software may be updated as improvements are created.
    Purpose Purpose statement not available
    Use Limitations
    • Produced by the NOAA National Centers for Environmental Information. Not subject to copyright protection within the United States.
    Dataset Citation
    • Cite as: NOAA NCEI Geomagnetic Modeling Team; British Geological Survey. 2024: World Magnetic Model 2025. NOAA National Centers for Environmental Information. https://doi.org/10.25921/aqfd-sd83. Accessed [date].
    Cited Authors
    • NOAA NCEI Geomagnetic Modeling Team
    • British Geological Survey Geomagnetism Team
      British Geological Survey
    Publishers
    • NOAA National Centers for Environmental Information
    Theme keywords Global Change Master Directory (GCMD) Science Keywords
    • Earth Science > Solid Earth > Geomagnetism > Magnetic Field
    • Earth Science > Solid Earth > Geomagnetism > Magnetic Intensity
    • Earth Science > Solid Earth > Geomagnetism > Magnetic Declination
    • Earth Science > Solid Earth > Geomagnetism > Magnetic Inclination
    Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    Place keywords Global Change Master Directory (GCMD) Location Keywords
    • Geographic Region > Global
    Use Constraints
    • Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
    Access Constraints
    • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
    Other Constraints Cite as: NOAA NCEI Geomagnetic Modeling Team; British Geological Survey. 2024: World Magnetic Model 2025. NOAA National Centers for Environmental Information. https://doi.org/10.25921/aqfd-sd83. Accessed [date].
    Fees
    • WMM2025 and associated softwares are all free and publically available
    Lineage information for: dataset
    Processor
    • NOAA National Centers for Environmental Information
    Processing Steps
    • Two parent models are independently developed by NCEI and BGS and then combined using a variety of techniques. For more detailed information please refer to the technical report associated with this model.
    Source Datasets
    • Swarm Satellite Data
    • World Data Center for Geomagnetism (Edinburgh)
    Lineage information for: repository
    Processing Steps
    • 2015-04-22T00:00:00 - NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
    Last Modified: 2024-12-17
    For questions about the information on this page, please email: ncei.info@noaa.gov