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this is nothing new...
look on any chart... in any one of the compass roses...
says right there "anual deviation of {blank} degrees".
basic plotting skills everyone should know.
T-rue
V-ariation
M-agnetic
D-eviation
C -mpass
calibrating your compass yourself isn't that hard either.
look in chapmans piloting...
but with gps today,, it's all forgotten...
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