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This tool calculates magnetic declination for a variety of locations across Canada and elsewhere. Users select a city (Canada only) from a drop-down menu or enter latitude and longitude values (works for any location), and the tool calculates the proper magnetic declination (the angular difference between observed magnetic North on a compass and geographic or 'true' North). There are also links to information on how to use magnetic declination with a compass, and how to use the calculator to determine values of all seven magnetic components. For locations in Canada, the Canadian Geomagnetic Reference Field (CGRF) is used; for other locations, the International Geomagnetic Reference Field (IGRF) is used.
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