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Here is some info off the TMC Forum's FAQ:
If I go from one country to another will my TMC receiver "roam" like my GSM phone?
In most countries and regions only one TMC service is available in a certain location. Most TMC receivers will automatically tune to the strongest TMC service. You should be able to receive free services across most of Europe as long as you have the appropriate navigation map disc. Where commercial services exist, access will depend on the partnerships and agreements established between operators and manufacturers.
How does TMC differ from TA (traffic announcements) and TP (traffic programme)?
TMC is a "silent" traffic data system, needing a special decoder in the receiver. The Traffic Announcement (TA) feature of a standard RDS radio allows interruption of a CD or cassette tape when there is a travel report from the radio station that is currently tuned-in. Stations broadcasting traffic announcements are labelled with the TP (Traffic Programme) flag, allowing them to be selected even when listening to another station.
How can I add TMC to my existing GPS navigation system?
Some GPS navigation systems allow you to add an external TMC receiver, if they do not already have one built-in. You will also need the appropriate software, which should be included in up-to-date map discs. A knowledgeable dealer should be able to tell you if this will be possible for your system.
If you would like to receive a commercial TMC service (see the Services Today section of this site to find whether this is the case), check beforehand with the service provider that your planned combination of map disc and GPS navigation system (and, if applicable, separate TMC receiver) will enable you to receive the service.
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