单项选择题
How is the annual rate of change for magnetic variation shown on a pilot chart?（）
A.Gray lines on the uppermost inset chart
B.Red lines on the main body of the chart
C.In parenthesis on the lines of equal magnetic variation
D.Annual rate of change is not shown
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相关考题
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单项选择题
In which source could you find the number of a chart for a certain geographic area?（）
A.Chart No.1
B.Catalog of Charts
C.IMO Practical Navigator
D.IMO Light List -
单项选择题
Isogonic lines are lines on a chart indicating （）.
A.points of equal variation
B.points of zero variation
C.the magnetic latitude
D.magnetic dip -
单项选择题
Lines on a chart which connect points of equal magnetic variation are called （）.
A.magnetic latitudes
B.magnetic declinations
C.dip
D.isogonic lines
