I've just picked up my GTI , I'm using Android Auto (AA).
Regarding the Cars GPS antenna, at least for Google maps in AA it looks like it's using the cars antenna.
When I was driving along with Google maps running in AA I had a look at the GPS symbol in the Notification bar of my phone.
I can only see it when the car has stopped and it's under a building for example.
It seems to be a lot more accurate than my phone running Google maps NAV just by it'self.
I's be surprised if Carplay wasn't doing something similar.
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