If like me you suffer from the read error message on your sat nav there is something that may cure it for zero outlay. I noticed it happening when the car was toasty warm and realised that the glovebox vent was filling the area with lovely hot air-so much so that the disc was very warm to the touch! Turning the vent off has stopped it happening so perhaps for some of you with the same problem it could be a simple and cheap solution.....
Regards
Dave
Regards
Dave