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The magnetic declination in a given area will change slowly...
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Maps of Magnetic Elements from the WMM2020. Contour maps were created for each of the seven magnetic elements (D, I, H, X, Y, Z, and F) and for their secular variation (rate of change).
This free utility will generate a PNG or SVG file representing a properly formatted declination diagram for a specific map. Background. In cartography, a declination diagram is used to provide a graphic representation of the variations between true north, grid north, and magnetic north on a map.
Magnetic declination (variation) calculator based on the IGRF magnetic field model. Estimates magnetic delination world-wide from 1900 - present.
Declination results are typically accurate to 30 minutes of arc, but environmental factors can cause magnetic field disturbances. The calculator provides an easy way for you to get results in HTML, XML, CSV, or JSON programmatically (API). Registration is required to access this service.
2 lip 2022 · Use the tool below to compute values for the geomagnetic field and secular variation for a given set of coordinates and date. This calculator uses the World Magnetic Model as released in Dec 2019.
Activate sensors ... Latitude: S N Longitude: