data output from FMS? - Thinking about autonomous vehicles

[autonomous]

I am very impressed with FMS. I'm interested in using it (or something similar) as part of a research project on autonomous aircraft. The big question - is there some way to get live aircraft data out of FMS? Say stream it to a serial port or some kind of interprocess communication hookup? Minimal option would be to write to a file, but that would get a little slow for my purposes I think. My plan would be then to have another program that interprets the output data and fakes what my GPS receiver would be telling me. Any ideas?