There also seems to be some real wierd behaviour on the TA after turns. For one thing, if you make a turn AND wait for it to straighten, the first bearing line after straightening always seems to be a bit off.
I used to think it was make a turn, wait for the TA to straighten - the next bearing line is a clean one.
In reality it seems to be more like, make a turn, wait for the TA to straighten, get a bearing line and the one after that is the clean bearing line.
Another quirk is that if the TA washes out during the turn (say you increase speed), when you slow down again, it immediately creates a bearing line when it stops being washed out. But that line seems to be the line that would be generated if you were continuing on your original course.
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