TMC is transmitted primarily in Europe
You need a TMC enabled CD or DVD from VDO-Dayton
I don't think Navteq offer TMC on their CDs
For the UK you need the second one down here :-
http://www.vdodayton-shop.com/start....=18&ShowLand=1
note the TMC/Itis Logo
Your TMC icon is Green when tuned in Red when not and black if there is no service or the CD does not have TMC codes
Most of you BMW guys will have either a BM24 or BM54 radio both usually have dual tuners one tuner automatically locks to the TMC transmitter
In the UK it is Classic FM.
The later BM54 offers muting for messages as normal and dynamic routing.
If you are unlucky enough to have a single tuner Radio then it must remain tuned to the correct station to receive broadcasts but CD or tape can also be used instead.
It is a brilliant system offering look ahead information and on several occasions has provide me with almost an instant voiced warnings of something that can only have happened a few minutes earlier the nav screen automatically switches to provide information on the problem it shows when the last exit will be in miles and you have the option to divert