The chart indicates the variation was 3° 45' W in 1988, and the annual change is decreasing 6'. If you use the chart in 1991, how much variation should you apply?
Given:
Compass variation = 3° 45' W in 1988
Annual change = 6'
What is asked?
Compass variation
Solution:
Step 1. Get the year difference. And then multiply the difference by the annual change.
3° 27' W is the variation to apply.
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Given:
Compass variation = 3° 45' W in 1988
Annual change = 6'
What is asked?
Compass variation
Solution:
Step 1. Get the year difference. And then multiply the difference by the annual change.
1991
- 1988
3
×6'
18'
×6'
18'
Step 2. Subtract 18' to 3° 45' because the annual change is decreasing.
3° 45’ W
- 18' 3° 27' W is the variation to apply.
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