The problem on the MMI3G B unit is that the location tables in the maps are for Trafficmaster not INRIX. So new maps with INRIX location tables would be needed assuming that the TMC supplier could be changed over in the head unit. Only other solution is to reinstate the Trafficmaster service which simply will not happen. I know that mobile phones etc can be used but the whole point of having a built in navigation system is that you do not have to use one.