The chart indicates the variation was 3°45'W...

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Question 1 of 2066636ee928f7522a1c51931f

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?

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Question 1 of 20

66636ee928f7522a1c51931f

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?

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🔍 Key Concepts

• How to update magnetic variation from the chart year to the year of use • What "annual change decreasing 6'" means in terms of adding or subtracting minutes each year • Converting between minutes (') and degrees (°) when applying several years of change

💭 Think About

• First find how many years have passed between 1988 and 1991 and express the total annual change in minutes of arc • Decide whether a west variation that is "decreasing" gets numerically smaller west, or moves toward east • After adjusting the original 3°45'W by the total change, check if your result is still west or has crossed over to east

✅ Before You Answer

• Confirm the number of years between the chart date and the problem date and multiply by 6' per year • Convert the total minutes you are adding or subtracting into degrees and minutes correctly (e.g., 60' = 1°) • Verify whether your final variation is labeled W or E based on whether the west variation has decreased or increased over time

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Question 1 of 2066636ee928f7522a1c51931f

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?

Back

Question 1 of 20

66636ee928f7522a1c51931f

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?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed