If you want to know if you are being tracked by GPS in your DIAD, there is a simple way to find out. Go to your communication screen. The list shows 6 options press # 8 (even though it is not a listed option). A new screen appears with alot of data. What you look for is the line with LON and LAT. If you see that then those are the exacts longitude and latitude bearings for where you are standing. Which means you are being tracked. A map can be printed out of exactly how you ran your route, how long you stopped and where you have been. Hope this info is helpfull.