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The chart shows you lines of equal declination $D$. You identify your location on the chart (which you have done and marked with an X in your second image). Then you determine on which line you are. It looks like the point is between the -26° line and the -28° line, so let's call it $D=-27^\circ$. That gives you a magnetic track of: $$ \varphi_\text{mag} = \...


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We've had a question like this before. I don't recall the title exactly. The calculation is only for the exact spot where you are located right now (or at some hypothetical point in the flight.) It has nothing to do with drawing long lines all the way across the map. If your track crosses multiple lines of declination then you'll be repeating the ...


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