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10 cards from this deck
Angle between true north and magnetic north
Points to North Pole, remains constant
Direction compass points, changes over time
How much magnetic declination shifts per year
Subtract total change from original declination
Add total change to original declination
Calculate years between current year and map year
Multiply by 6: 0.5 × 6 = 30'
Subtract 60 from minutes, add 1 to degrees
Always express as 'west of true north'
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