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.