In a message dated 07/11/2006 13:46:43 GMT Standard Time, bones@xxxxxxx writes: Is there any other program that lists variables like FS so that calculations could be tested on it? bones Bones, I think its more like defining an interface to the program. I have to say that while writing the code for my XML gauges, most things work as you would expect, but I've had some curious things happen while testing the autopilot. Investigations show that these vary from aircraft to aircraft, I'm concluding that having two autopilots running in parallel gives rise to conflicts! More tests to do including adding the //lines in front of the resident AP in the panel.cfg, to see if that makes things more consistent. Sometimes I feel that adding things to FS is rather like shining a torch into a dark warehouse. Where the light falls you can see what is happening, but elsewhere who knows what's going on! Frank T.