How is the annual rate of change for...

Question 1 / 2707066636ee928f7522a1c519134

Question 1 of 2707066636ee928f7522a1c519134

How is the annual rate of change for magnetic variation shown on a pilot chart?

Question 1 of 27070

How is the annual rate of change for magnetic variation shown on a pilot chart?

🔍 Key Concepts

• Pilot charts often show both the magnetic variation and how it changes over time. • Lines of equal magnetic variation are called isogonic lines. • The annual rate of change must be tied directly to the variation value so a navigator can update it for the present year.

💭 Think About

• On what feature of the chart would it be most logical to print the amount the variation changes each year? • If you needed to quickly apply the yearly change to a given variation value at your position, where would you look so you don’t have to scan the whole chart? • Which option specifically connects the rate of change to the value of variation at a particular place?

✅ Before You Answer

• Identify where the lines of equal magnetic variation are on a pilot chart and how they’re labeled. • Check which choice explicitly links the annual rate of change to those variation lines, rather than using a separate color or inset. • Confirm that the method would allow a navigator to easily update the variation from the chart’s reference year to the current year.

Question 1 of 27070

How is the annual rate of change for magnetic variation shown on a pilot chart?

Red lines on the main body of the chart

Annual rate of change is not shown.

Gray lines on the uppermost inset chart

In parenthesis on the lines of equal magnetic variation

Question 1 / 2707066636ee928f7522a1c519134

Question 1 of 2707066636ee928f7522a1c519134

How is the annual rate of change for magnetic variation shown on a pilot chart?

Back

Question 1 of 27070

How is the annual rate of change for magnetic variation shown on a pilot chart?