How do I get traffic to work on WIN CE head unit?

I recently installed Mapfactor Navigator (free) on my head unit which is a WIN CE device.

I have the software working nicely and have been using it for over a week. The open maps are nicely detailed and the navigation instructions are very good.

One problem however.... I can't get the traffic information to work on it.

I go to the TMC options and select "Open TMC".... I presume the software then "listens" to the radio's "traffic announcement" channels?

Or does it?

Well, mine isn't doing this and when I go to find the traffic information within the software options it sticks on the "waiting for traffic update information"..... and basically just sits on that screen for ever.

any help would be much appreciated.

p.s.

do I need additional equipment?

or would a radio with RDS and the option to turn on the 'traffic announcements' on it be sufficient?