Nice idea but most people most of the time, in their own country, know what the speed limit is, where they are at the moment..the issue is that it does not give any guidance on known speed cameras etc..
I'm all for an integrated approach but since it does not provide any speed camera warnings, unlike say Volvo, then you still need a 3rd party device to help you there..
I use Co-Pilot on my iphone in the Z and I have an ipad in my volvo with it on...
You can tailor the speed cameras warning in terms of range/speed etc and it gives a good heads up plus a better /alternative map to idrive..