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World Magnetic Model

Publisher
British Geological Survey (BGS)
Updated
13 August 2026
Topic
Not set
Licence
Not set

Summary

The World Magnetic Model (WMM) is a standard model of the core and large-scale crustal magnetic field. It is the standard model for navigation, attitude, and heading referencing systems that use the geomagnetic field. The WMM is also used for civilian applications, including navigation and heading systems. A new version of the model is updated every five years to address changes in Earth’s magnetic field. The current version (WMM2025) was released on December 17, 2024, and will remain valid until late 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.

Data links

Link Format Preview Updated
Geomagnetic Model Web Service: Available Models 13/8/2026
World Magnetic Model (WMM) HTML 13/8/2026

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Additional information

Source Metadata
XML, HTML
Date added
13 August 2026
Harvest GUID
493169da-11d4-2073-e054-002128a47908
Extent (Latitude)
90.0000° to -90.0000°
Extent (Longitude)
-180.0000° to 180.0000°
Dataset reference date (publication)
2014
Frequency of update
asNeeded
Access constraints
The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.
Responsible party
British Geological Survey (author, distributor, pointOfContact)
ISO 19139 resource type
dataset
Metadata language
eng