The very latest Sat_Nav system released in the UK/europe in september has a fault which this week BMW have recognised and issued a "PUMA NUMBER" on it.
Mine has this fault my car being two weeks old
, the system sends me down roads that are wrong, does not divert and generally is useless.
I am seaking compensation as I write. good luck with your new sat-nav.
The cost here is £2000.00 for the nav, thats two grand of wasted moneys.