Hi, Thanks to some code scattered on the internet I am able to read directly the latitude/longitude/altitude of my aircraft. But for the life of me I cannot write, (or set my position), back to the dll, (what I ultimately want to do). For example, I can read my latitude at 0x20CE3560, but I cannot write it. I can update the value of that offset, (and the value does change), but the aircraft does not move to the new location. I think this is because I need to 'refresh' fs9 so it updates to the values I have set. So, what could I be missing? How can I write the values directly to fs9? Regards, Sims.