The World Magnetic Model is the standard model of the US Department of Defense, the UK
Ministry of Defence, the North Atlantic Treaty Organization (NATO), and the World Hydrographic Office
(WHO) navigation and attitude/heading referencing systems. It is also used widely in civilian navigation
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, 2009.
The current model, WMM-2005 (published 12/2004), is available from this web site or
by contacting NGDC.
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