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A sheet states a magnetic declination of 2 degrees west, decreasing by 6 minutes each year. What will it be 10 years later?

  • A.3 degrees west
  • B.2 degrees west, unchanged
  • C.1 degree west
  • D.2 degrees 60 minutes west

Answer: C

Six minutes a year over ten years is 60 minutes, or one degree, and the declination is decreasing, so 2 degrees becomes 1 degree west. Applying the annual change is why the date of the figure is always printed with it.

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