I always enabled my GPS since I use that a lot. Ah I see, actually one of my map is CGPSMapper compiled. I guess that's why I have a random crash (I chage my active map back and forth between City Navigator and my CGPSMapper compiled map as needed). About the DEM, it work when I put it in .System root. The problem is, I also need another DEM for another country every now and then. Does this mean I have to change the DEM in the .System root every time?