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Correction for magnetic deviation #120
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In the JA37 flight manual volume 1, page 392 apparently some similar fixes are taken for true North. |
I think I misunderstood this issue completely. I thought course correction was used to display magnetic heading on the instruments, using the true heading from the INS (for the JA at least, I think true heading is used internally). I now realise that you probably meant that the instruments are supposed to display true heading. This just seemed too strange to me at the time, sorry. This seems to confirm it: Also, section 20.3.3 from the AJS manual seems to indicate that the heading gyro is indeed aligned with magnetic heading, This is going to make flying with other aircrafts a lot more fun. |
In the real Viggen, the difference between true heading and magnetic heading is corrected automatically. See chapter 3.4 on page 312 in Del 1 of the AJS manuals.
The current Viggen in FG does nothing like this and the HI correction in Instruments does not help neither (the only effect of that one seems to be to change the map direction in the TI in the JaDi version).
I propose the following:
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