That OnStar button is a service, it needs location. Other mfgrs have some kind of remote assistance service too. Now, what if the owner have not subscribed?
Why does it need to keep a long-term history, though? Isn't an ephemeral ping to get the current location enough? Or if you're trying for better resiliency, let it ping as often as you want but be responsible and only cache it for an hour or a day or whatever. Even a day is probably too long to be practical. They're not going to send help to a location ping from 18 hours ago...