Magnetic Zone Reference Chart
Dec. 26, 2024
Chart showing the Earth's magnetic field | U.S. Geological Survey International Geomagnetic Reference Field (IGRF) | BGS Geomagnetism International Geomagnetic Reference Field (IGRF) | BGS Geomagnetism File:Magnetic Declination Chart for the International Geomagnetic Reference Field, 2005 (small).gif - Wikipedia | Magnetic Zone Reference Chart