The map has nothing to do with your FM transmission.
It is part of the Navcore and TT was legally required to remove the FM instructions because it is legally not allowed to have asilent FM signal (that would be the case between instructions).
The new 8.390 Navcore is able to overcome that problem because it is a truck Navcore and TT was able to get a permission because modern trucks won't let the weak FM signal pass to the outside - please don't ask me about the deatials of that deal
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