I've recently installed GrapheneOS on a Pixel 4a to try it out. I'm particularly interested in seeing how sandboxed Google Play Services behave, and so have set them up. IIRC I've set up the phone to forward location requests to the OS, but I can't currently find where the setting for that is located (hints welcome!).
Anyway, I've noticed frequent location access notifications, roughly every minute or perhaps even less. It's always GmsCompat making the requests. In the permissions manager there are no apps listed has having location access all the time and only three allowed to access maps whilst in use - Google Maps, OsmAnd and Opensignal.
Is this frequent location access to be expected, and if so what is it doing? If it is normal then it might be useful if this notification could be disabled.