That's right... "Would I be right in assuming you want to use x-plane as a visual system, slaved to another input source for the flight data?" As you say, I would be surprised if it hadn't been done before - probably many times. I looked through the plugin SDK site and didn't see anything. It was clear, however, that it could be done by writing a new plugin that simply overrode the aircraft data over and over, every time it was called. I can certainly do that. Still, it wasn't clear if there wasn't another BETTER way - seemed kind of brute force. tnx...