"Bill,
Understood with the filter - I'll pass the data through a FIR filter and see how well I can make it perform. Hopefully I will not have to introduce too much delay.
Regarding the horizon - I follow the approach using the last line in the Matrix…"
"You might want to try Sourceforge - search for 'EFIS'.
There is a project there written in C or C++ (I cannot remember) that would be a very good basis for such a display.
Doug"