WWII - TRUE and MAGNETIC Compass Headings are Reporting Reversed.

[Bowie]

The Magnetic Compass in the A/C (P-51D-25 N/A) agrees w/ the NORMANDY Map Compass Rose: *M-9.7° (~ -10°).

But when interrogating the A/C, from either the F10 Map or F2 View Key, the HDG XXX°M, in BLUE, is reading +10° Higher than the True reading to the right of it, which is actually reading  the Magnetic heading.

 

Please Advise.

 

Bowie