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Magnetic declination varies as the Earth's dipole slowly evolves so it changes from year to year. Also, it depends on the position on the Earth. Across the DCS Normandy map in 1944, there was historically values ranging from approx. 9 degrees (Le Havre) to 10 degrees (Cherbourg).

 

There is a useful online tool here, which allows you to look at the changes in position and year of magnetic variation: https://maps.ngdc.noaa.gov/viewers/historical_declination/

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