On a semi related note, is there any optimization to be done for improving location performance if you don’t use google play services?

    applesbana checking to see if your carrier supports SUPL via mobile data, this is because certain APN configurations allow for SUPL (Secure User Plane Location) protocol such as in this example APN config:

    <apn carrier="CarrierXYZ"
    mcc="123"
    mnc="123"
    apn="carrierxyz"
    type="default,supl,mms,ims,cbs"
    mmsc="http://mms.carrierxyz.com"
    mmsproxy="0.0.0.0"
    mmsport="80"
    bearer_bitmask="4|5|6|7|8|12"
    />

    This service is separate from PSDS but also provides another channel for A-GPS data to be gained.
    They do the same but by different means, one comes from the carrier the other comes from the source listed under Network settings as mentioned above.

    Read more: https://www.openmobilealliance.org/release/SUPL/V3_0-20100921-C/OMA-RD-SUPL-V3_0-20100921-C.pdf

    Improved Indoor Location Accuracy addresses the special requirements arising from indoor location issues. An example of such is the support for floor level information as well as the use of relative instead of global coordinates.

        Eirikr70 I left it at the default on the P6s, but on the 4a this config is not present

          unwat Yes, all those configurations are set and the GOS sandboxed play services UI does not show any potential issues.

            coffee

            I'm not MetropleX, but maybe I can answer the question for them...

            You can find that here, under the owner profile: Settings > Network & internet > SIMs > Access Point Names

            Obviously, different mobile networks will be different, but mine has two APNs, one labeled "internet" and one labeled "mms". On my phone, SUPL is defined in the "internet" APN. For example, under "APN type" mine says default,supl,hipri.

                unwat Thanks ;)

                I only have one APN ("internet") which
                APN type is default,mms,supl.

                Should I try resetting the APNs to default? (edit: had no effect)

                    coffee

                    No. supl should help make geolocation faster, which is why MetropleX was asking.

                    Guess it's back to the drawing board to figure out what the issue is...

                      Honestly if you are just using GNSS without any sort of network location AGPS method, then the issues you describe are drawbacks of the technology itself not the OS.

                      Just how GPS works needing line of sight to the sky and internal working is dependent on the building its material make up and density of surrounding buildings too, it cannot be mitigated without a network based location solution, which GrapheneOS doesnt supply and requires sandboxed play services for.

                      If using network location have you toggled SETTINGS>LOCATION>LOCATION SERVICES to on for both wifi and bluetooth?

                        MetropleX I do use Google Play Services and have them enabled.
                        However, the system, including Play Services, apparently does not use network-based location determination.

                          Could it be that my network carrier provides bad or not-standard-compliant information / supl so network location positioning does not work properly for me?
                          My network carrier I am using is not popular, so I guess the combination of my carrier, Pixels and GOS might be rare.

                            3 months later

                            coffee not sure if you've given up on GrapheneOS, but try enabling location permission all the time for play services. This helps me immensely when in area where I can't seem to get decent location services working