I don't know what is NA, but what i know is that if you have the latest version of sync (3.7), the latest map (for Europe F4) and the radio unit with RDS than TMC is working.
In Russia we got on our Explorers radio units with the RDS with US frequences, but in Russia we have the europeans frequences so the RDS (we can't see the name of the radio stations) and TMC (no traffic jam in navigation) are not working.
FMC took this in account and the radio unit in the new Fusion comes with the european frequencies of RDS and the TMC is working fine in their navigation.
On our russian forum we are discussing now how to adapt the radio unit from Fusion to Explorer as the navigation without traffic jams in big cities is useless.