I’m glad you brought this up. I thought I was the only one who was confused about this.
The manual says something about requiring a “subscription” to have it function, but does not say what type of subscription. Is just having a Google account sufficient, or must it be OnStar????
I just took delivery of 2024 Lux2 and as long as you have a google account and synched I have had no issues using the navigation from google maps. The car also comes with 36 months of Onstar Safety so you can send directions etc to the vehicle. So far it has been working flawlessly. Getting used to the features takes a bit of time though.