Warning!

Javascript is disabled on this browser.
Javascript must be enabled for this website to display and function correctly.
spacer

Models, Charts and Magnetic Data for Navigation
Geomagnetic field models are used in navigation, geophysical surveys, oil production, and in scientific studies ranging from the upper atmosphere to the Earth's deep interior. BGS has many years' experience in modelling the geomagnetic field on regional and global scales.

  • In Britain

    A model of the Earth's magnetic field, applicable to the area of Great Britain and valid for the present time and the near future, is derived every year. This model is used to compute magnetic north information for Ordnance Survey map products.

    Grid Magnetic Angle Calculator

  • Worldwide

    World Magnetic Model

    The World Magnetic Model (WMM), produced jointly with the US National Oceanographic and Atmospheric Administration's National Geophysical Data Center, is the standard model in UK Ministry of Defence and US Department of Defense navigation and attitude reference systems and is also used widely in civilian navigation systems. The model is used on marine charts and is revised every five years. The current model, WMM2010, is valid till 2015.0. A pdf file describing the derivation of WMM2010 is available for download (21 MB).

    World Magnetic Model Chart Selector

    BGS Global Geomagnetic Model

    The BGS Global Geomagnetic Model (BGGM) is produced for the oil industry to assist in directional drilling and is revised annually.

    International Geomagnetic Reference Field

    The International Geomagnetic Reference Field (IGRF) is produced by the International Association of Geomagnetism and Aeronomy. BGS plays an active role in its production.

    BGS supports this modelling activity by operating magnetic observatories in the UK and overseas, conducting the UK magnetic survey, collecting data from magnetic observatories and from land, sea, air and satellite surveys from sources worldwide.

    		•