Why are heading in PFD and map off by exactly 10 degrees?

Question

I was flying on my X-plane 11 flight simulator today and noticed something quite unsettling.

This was a VFR flight between KIAD and KDCA. I pulled up my map for reference and noticed I was flying orthogonal to the map's north direction, even though I was flying a heading of 100.

The image shows the map and the PFD for your reference.

What is going on? Did I mess with some heading calibration setup? 100 degrees and 90 degrees are perfectly 10 degrees off, so I don't think this has to do with magnetic north issues.

P.S. Strangely, I got to my destination simply following the headings from ATC.

Winds aloft possibly? One is ground track, the other is heading, they can often be different with wind... — Ron Beyer, May 18 '20 at 18:35
related (not sure this is a dupe, your question being more specific): What are the differences between Bearing vs Course vs Direction vs Heading vs Track? — Manu H, May 18 '20 at 19:46
another related question: How to calculations deviation on a magnetic compass and effect of it? — Manu H, May 18 '20 at 19:49

score 3 · Accepted Answer · answered May 18 '20 at 18:40

3

KIAD has a magnetic variation of 10 degrees west, and KDCA has a magnetic variation of 11 degrees west, so true vs. magnetic north actually makes sense.

answered May 18 '20 at 18:40

Eugene Styer

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I'm a little new to navigation.. I could benefit from it if you explain a little more, or redirect me to some answers which address this. I tried a search or two, but couldn't find much. – William R. Ebenezer May 18 '20 at 19:33
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@WilliamR.Ebenezer I have closed your question as a duplicate of another which will fully explain the difference between true and magnetic north. – Jamiec May 18 '20 at 19:58
@Jamiec Thanks. – William R. Ebenezer May 19 '20 at 04:07

Why are heading in PFD and map off by exactly 10 degrees?

1 Answers1