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 NCEI on behalf of
NGA. The model is produced at 5-year intervals, with the current model expiring on December 31,
2019.
WMM2015 Degraded Performance Notice
WMM Grid Variation (GV) error has recently exceeded the WMM performance specification in
the Arctic region. Other geographic areas and other model parameters are not affected. We invite your
feedback on potential impacts and whether an out-of-cycle WMM update would benefit your operations.
WMM2015 Performance White Paper
Please contact geomag.models@noaa.gov for
comments or questions.
NOAA WMM2015 Press Release
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