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Original file (5,400 × 3,600 pixels, file size: 1.57 MB, MIME type: application/pdf) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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File:Magnetic Declination Chart for the International Geomagnetic Reference Field, 2005.pdf. Add languages. Page contents not supported in other languages.
English: This is a world map of magnetic declination created by the National Geophysical Data Center at NOAA. Français : Carte mondiale de la déclinaison magnétique terrestre créé par le centre national des donnée géophysiques ( NGDC ) de l'agence américaine responsable de l'étude de l'océan et de l'atmosphère ( NOAA ).
Instead individual printed elements on the chart (such as VOR compass roses) are updated with each revision of the chart to reflect changes in magnetic declination. For an example refer to the sectional chart slightly west of Winston-Salem, North Carolina in March 2021, magnetic north is 8 degrees west of true north ( Note the dashed line ...
Magnetic declination map at sea-level for the year 2010 derived from WMM2010. The World Magnetic Model ( WMM ) is a large spatial-scale representation of the Earth's magnetic field. It was developed jointly by the US National Geophysical Data Center and the British Geological Survey .
Over hundreds of years, magnetic declination is observed to vary over tens of degrees. [13] The animation shows how global declinations have changed over the last few centuries. [34] The direction and intensity of the dipole change over time. Over the last two centuries the dipole strength has been decreasing at a rate of about 6.3% per century ...
A novel approach, apparently originating with the Jesuit missionary Christoforo Borri, was to create charts that mapped points of equal magnetic declination. [c] With an accurate reading of the latitude and the magnetic declination the navigator could determine their longitude using the chart. [11]