It's an old bug that TomTom hasn't yet bothered to fix. It comes from the time when built-in GPS was non-existant, but bluetooth GPS pucks were all the rage. TomTom thinks it has to have bluetooth on in order to get a GPS lock, which of course it doesn't.
You'd think we would have put to bed the old cell-connection-is-required myth by now, but I guess not. Rest assured that GPS functions just fine without cell towers. Unless of course Germany has a secret CDMA network that no one knows about, because my GPS worked fine in Europe
