Does GrapheneOS disable AGPS by default or send information to Google?
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GrapheneOS doesn't include any supplementary location services and only has GPS-based location detection. Adding support for local supplementary location services is planned:
github.com/GrapheneOS/os_
It does include standard support for downloading GPS almanacs to improve GPS.
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GPS almanacs are downloaded via HTTPS GET requests from xtrapath1.izatcloud.net/xtra3grc.bin, xtrapath2.izatcloud.net/xtra3grc.bin or xtrapath3.izatcloud.net/xtra3grc.bin. These are databases of satellite locations speeding up initial GPS lock. There are only a few other default connections, which are all important.
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GrapheneOS has no analytics or tracking. It doesn't send data to Google or anyone else. The only default connections are trivial HTTP(S) GET requests fetching trivial data, not sending anything. Updater app connects to seamlessupdate.app every 4 hours to check for updates.
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There are also connectivity checks designed to mimic a web browser user agent are performed by using HTTP and HTTPS to fetch standard URLs generating an HTTP 204 status code. This is used to detect when internet connectivity is lost on a network, which triggers fallback to other
available networks if possible. These checks are designed to detect and handle captive portals which substitute the expected empty 204 response with their own web page. It helps for these to use a very common domain and URL in order to bypass whitelisting systems only permitting
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access to common domains. GrapheneOS leaves these as the defaults which are google.com/generate_204, connectivitycheck.gstatic.com/generate_204, google.com/gen_204 and play.googleapis.com/generate_204. It just makes HTTP(S) GET requests with a static placeholder user agent like every Android device.
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