I can only speak for Discover Pro on the golf but it seems that in May 2017, Google withdrew the licence from VW so google earth is no longer an option, if anyone knows how to enable it I’d be delighted to find out!. Yes the car does need to connect to your phone , I use my phone as a mobile hotspot, that way I have dynamic nav with road congestion displayed (hugely better and much faster than the FM traffic Program) but best of all, Siri and Apple Music works with voice control via CarPlay
for example just press the voice button on the steering wheel and say play xxxx etc and it gives you access to 40million odd tracks and podcasts etc
also, the discover pro will play video from the dvd drive or an SD card. I have a few films on an SD card for that.
finally, updates happen around jan/July but all you need to do is download the update to an SD card (32 gb or higher) shove it in one of the SD slots and bobs your uncle...all is automatic and you can remove the SD card after as it stores everything on a hard drive rather than the card like the non-pro system. I also added a speed camera dataset to it so my maps have them marked clearly too
A lot of folk here think the pro system is an unnecessary expense but I love mine and I’m sure you will too, especially if you are a bit tech orientated like me.
next you will be wanting obd11 to enable all the wee features and tweaks VW don’t give you (A whole different topic🙄)