Every map channel I've seen has been analog, even on otherwise purely digital IFE, implying that the map video signal is generated by a device networked on the

Every map channel I've seen has been analog, even on otherwise purely digital IFE, implying that the map video signal is generated by a device networked on the avionics side and then piped by standard RF to the IFE, like the address system. So no two-way communication.