i have a 740IL 2000 which I purchased from texas. I bought a the latest nav cd from ebay and installed it. Strangely enough, i have to tell the car where it is located! The car cannot find itself. If I input the vehicle position, it will give me the directions, but shortly enroute, it will show me miles away from my location. This has been very frustrating. I called navteq and they referred me to bmw to update to the latest OS v25 which I did. Still the problem persists. The only difference I noticed after the OS installation was the better screen, nothing else. I called navteq again, this time they said i need caliberation. I am not trying to spend alot going back and forth on this issue so am wondering if the nav drive could be the problem as well. The map is clear and precise but the problem is that the nav system losing track of the vehicle completely or shows it somewhere else and starts giving me wrong directions. PLEASE what should I do. By the way I have a markII, should I upgrade to markIII? I heard I could do it myself. How much did it cost you to change the Nav drive. Thanks.