Oh, so the 550/700 is compatible with SU5 already?

I think someone mentioned here before that there is an Auto Switch over to Mach Speed around that point....

It is very simple, and very hard.  I have visited several forums but asobo has never commented on this situation. I guess they ignore it.

I am not sure of the scale of that image but to be honest, I have seen worse in very modern 737's and I doubt any pilot would worry about that.  These are seriously complex calculations with a lot of factors (air density, wind speed and direction) that are not stable. 

It is very simple, the SDK has to explain how we can access the data, right now that is not defined and we can't use it. We simply have zero information on when it might be available.