How To Solve For Actual Variation

The chart indicates the variation was 3° 48' W in 1996 and the annual change is 8' W. If you use the chart in 2000, how much variation should you apply 

Given: 

             Variation = 3° 48' W in year 1996

   Annual change = 8' W

         Chart to use = year 2000

Solution: 

1. We are going to multiply the annual change of variation by 4 since our reference of variation is in the year 1996, and the chart to use is in the year 2000.

           Annual change = 8'

                                        × 4   

                   Correction = 0° 32' W

2. We can now get the actual variation by adding the correction and the variation in 1996.

                    Correction = 0° 32' W

                                         +

             1996 Variation = 3° 48' W  

          Actual variation = 4° 20° W

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