The chart indicates the variation was 3°45'E in 1988, and the annual change is increasing 6'. If you use the chart in 1991 how much variation should you apply?

Question

The chart indicates the variation was 3&deg;45'E in 1988, and the annual change is increasing 6'. If you use the chart in 1991 how much variation should you apply?

Accepted Answer

Option D: 4&deg;03'E. Calculate easterly variation progression over the 3-year interval between 1988 and 1991. Multiplying 3 years by 6' gives 18' of increase. Adding 18' to the base 3°45'E results in 4°03'E following standard Bowditch navigational procedures.

The chart indicates the variation was 3&deg;45'E in 1988, and the annual change is increasing 6'. If you use the chart in 1991 how much variation should you apply?

The chart indicates the variation was 3°45'E in 1988, and the annual change is increasing 6'. If you use the chart in 1991 how much variation should you apply?