Satellite navigation

Just bought a new c8 HTC does this car have its own sat nav or do you rely on CarPlay.lumen seem to think it doesn’t but google tells me it does?

Congrats on the new car! Not having a C8, I don't know. Suggest you ask the question on the Facebook C8 UK Owners group. That was started by Craig the salesman at now closed Ian Allan. He is still one of the groups Admins. That's where most UK C8 owners are "chatting." C8 owner Stuart ("Mr Cricket") on here may be able to answer the question?
C8 Corvette owners UK | Facebook
When I had my UK spec C7 a few years back with sat nav, that had the GM "Onstar" functionality, including an app on your phone to monitor/tell you about the car. GM "withdrew/canned" Onstar in Europe circa 2020.