-20 30 Annual rate of change of declination for 2020.0 to ...

Annual rate of change of declination for 2020.0 to 2025.0 from the World Magnetic Model (WMM2020). Red — easterly change, blue — westerly change, — zero change. Contour interval is 2"/year, white star is location of a magnetic pole and projection is Mercator. This green is an example of an isoporic chart. ................
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