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I have disconnected the USB drive several times and when I started the Navigation system without it, the usual message about putting in an activation code would come up. But inserting the USB drive would remove that message. I think that activation code request is for activating the map that is installed which in this case means the U.S. map since that is the one installed in the car (with the USB drive inserted, the map in the USB then becomes the default map). The map installed in the USB is the European map and as such should not have an activation code or if it has one has already been entered.
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