Compass rose, magnetic variation

4° 15' W 2009 (8' E) on the Magnetic North arrow means:
      Magnetic Variation 4° 15' W in 2009
      annual change 8' E

Hence, in 2011 this variation is estimated to be 3° 59' (almost 4° West), and for 2020 the estimate is 2° 47' W.

Magnetic variation found in the nautical chart's compass rose