The first consideration is that the service only works in the cities of Sao Paulo, Rio de Janeiro and Belo Horizonte. Being in one of them, make sure you entered the correct code signing traffic from the instructions mentioned earlier in this topic. The service should work, because your machine and receiver are compatible. Make sure also that two signatures appear as Navteq Br. Even without signing a receiver must tune the frequencies of radio traffic, as is the navteq (90.5 SP) or Maplink (96.1 SP), and if not, its receptor is defective, a real possibility to consider.