Scary is right.

At Chelton, there are two guys that write the application code. For each code writer there are 10 code checkers that scrutinize the code line by line and test every condition and permutation. This is done to meet the software certification requirement s of DO178.  Why would an experimental D2 customer care what Chelton does  with their certified code?  Think about it. The most efficient way (lowest cost) to maintain two software product lines is to make them as common a possible.  Why maintain two code bases when you can maintain one and compile it into different versions, and since you already have to do all that pesky testing.......

This is common practice among all the EFIS companies with certified products that also license product for the experimental market.

Ask ANY EFIS supplier (Chelton, Dynon, BM, OP,  GRT) and they will tell you that if they knew how hard it would be to build a reliable EFIS system they would likely have never gotten into the business.

Regards
Brent Regan