Yeah could just use Google Maps on the GrapheneOS device works with or without Play Services and only uses GPS/GNSS no network location from Google unless you want it.
OSMAnd+, Organic Maps are just two other options.
As far as Calendar goes, Fossify fork of SimpleMobileTools Calendar for on device might work if they keep it updated. However if you're a Proton user that avenue is good, I use Tuta's. Both support importing .ics.
How do you disable "netwerk location" ?
You don't need to disable it, by default the OS uses only GPS/GNSS.
Network location is opt-in by installing Play Services, enabling wifi and bluetooth scanning under Location Services, followed by disabling the routing to GPS/GNSS via tapping the persistent GMSCompat notitication that tells you Play Services is running.
Oh wow, ok awesome! Didn't get that and switching "Network" & "Location" made me nervous😉.
Thanks
