New phone mount accessory from BMW

[Grumpy Goat]

With the new mount and phone connected to the bike why does the phone need to use the connected app?
If you want navigation I would think you would use Google Maps.

I got the impression that the navigation using the Connected app uses downloaded maps. Could be wrong as I only briefly downloaded it yesterday to see if there was any part of it I could use not having a TFT bike. There is none., Was looking for a bike right off the bat.