I'm wondering whether anyone can throw some light on this problem.

I have a 2003 E46 with Sat nav. The software is updated and I have a copy of 2008-1 High Navigation disc currently in the drive. Everything was fine until the clocks went back the other week. When I altered the clock, the computer alters the time +1 hr GMT and it does this within a few minutes of me altering it. I've narrowed it down to the sat nav disc as when I put my original 2003 disc in, the clock stays set. I've checked on the service menu and the clock is correct via the satellite in the menus.

Is there a way of adjusting the info on the disc via Navtweak or Navcoder? I have another copy of same disc and it does it with that as well. I still have the image on my hard drive but don't know what I'm looking for.

Any help on the matter would be appreciated, thanks.