I have MK3 Navigation system. About 4 weeks ago, I had a dead battery and all the lights on the cluster instrument were off. The NAV GPS has not worked properly since that day. The North South indicator pointed in the wrong direction, for example pointing South instead of North. The GPS locators does not seem to work properly, it shows the car's position at a completely different area than the area I live. I am able to restore the function of the lights on the cluster but the Navigation and GPS system are still not working properly. Anybody has this problem or have any idea how to fix this? TIA.