I made a conscious choice not to upgrade to the built in sat nav unit, as the app connect will allow you to use your phones map/navigation app (as well as music and phon) and have it displayed on the head unit - or at least that’s the way I understand it.
There’s a couple of good videos on youtube if you search California Chris. He’s done one for apple and android.
So to me, seems worthwhile if you want that functionality.