by Yurbuh Tuggly » Sun Feb 26, 2012 7:56 pm
In order to receive "live traffic", it depends what you mean by that. A unit with a TMC receiver will (MAY, depending where you are) be able to receive various alerts as to road conditions and depending what GPS software you use, use this info (which is piggy-backed on FM station broadcasts) to either alert you as you drive, or to automatically modify your route. This has nothing to do with "FM Transmitter"...that's a whole different thing that broadcasts any sounds that the unit makes to a chosen frequency that you tune to on your in-car FM stereo.
Other "Live traffic" may be available if the unit has a way to keep an internet connection (by WiFi, etc), but this is very rare in a stand alone GPS unit.