The unit is an am fm cd changer control with nav, it has a small display in it that is only a turn indicator with an arrow, it also has voice guidance as do the rest of the Bmws and is made by Phillips. Could somebody please tell me a little about the Navigation unit in the Z8? I've noticed that there does not appear to be a big navigation screen. Is the navigation unit one of those combination Nav and Receiver? Does anyone know who makes the unit?