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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.
Original file (5,400 × 4,500 pixels, file size: 3.06 MB, MIME type: application/pdf) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
The following other wikis use this file: Usage on bn.wikipedia.org চৌম্বক বিচ্যুতি; Usage on hr.wikipedia.org Izogona
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 ).
N g is geographic or true north, N m is magnetic north, and δ is magnetic declination. Magnetic declination (also called magnetic variation) is the angle between magnetic north and true north at a particular location on the Earth's surface. The angle can change over time due to polar wandering.
Magnetic declination. A compass needle does not in general point true north. The variation from true north varies with location, and it was suggested that this could provide a basis for determination of longitude. With the exception of magnetic declination, all proved practicable methods. Developments on land and sea, however, were very different.
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 .
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