UnifiedNlp Backend that uses Apple's service to resolve wifi locations. Location calculation is done onboard and wifi locations are cached to minimize data usage.
If you use an app like SatStat with only that backend enabled you can see the location and uncertainty for both it and for the satellite reported position.
You can also use "adb logcat" to see what various backends are reporting to UnifiedNLP/microG.
How does one verify this is working?