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Old 12th Jan 2019, 10:08
  #16 (permalink)  
Asturias56
 
Join Date: Oct 2018
Location: Ferrara
Posts: 536
Short term - change in compass declination, repainting work etc

medium term - gradual decline in field strength and more variability

long term - flip - but that may take 500 years - nothing to much to worry about - its happened lots of times since Homo sap. started
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