Unless the SPV 5000 has any GPS or AGPS hardware built in then you will need some kind of GPS receiver to operate with the softare (i.e. Tom Tom or Navman or similar).
GPS receivers come in two types, wired or Bluetooth. The latter is probably more convenient than the wired. The GPS receiver receives the sattelite info and passes it via its link (wire or Bluetooth) to the Sat Nav software on the mobile phone which in turn make sense of the coordinates to tell you where you are and all the other wonderful stuff that such software does.
Tom Tom, for one, sell packaged sets of its Nav software and hardware. Or you can buy the software and GPS receiver hardware a' la carte from different vendors.
HTH
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