In this post:
it was brought up that Mozilla Location Services (MLS) is being retired. I believe it is now defunct. I also recall some further discussion about it but couldn’t find it. Given that, what are we using currently for location services? Is there a plan to replace MLS with an alternative? Perhaps Nominatim?
Regain your privacy! Adopt /e/OS the deGoogled mobile OS and online services
This closed thread updates to post MSL Use /e/OS’s location system ... What does that option entail?
ha that one is also closed and also didnt have anything referring the the question 
Would you have any knowledge here?
Hi, seems to be Nominatim. In v2.7 go to Settings > System > microG > Location and there Nominatim is mentioned under “Address resolver”.
Hm, it also has: “request from Mozilla” and “use eoss location system”
“Nominatim uses OpenStreetMap data to find locations on Earth by name and address (geocoding). It can also do the reverse, find an address for any location on the planet.” … https://nominatim.org/
This complements location services, but it can’t give you a location if you don’t give it an address.
It’s an alternative to Google’s Place Search.
Mozilla location services used a database of known Wi-Fi locations and cell network tower locations to calculate the phone’s approximate location as an alternative to satellite based systems like GPS.
It actually did and came to the conclusion: positon.xyz
(Edited, thanks @aibd!)
Mozilla is now defunct though?
The location service is, yes.
Here’s some random grab from the internet with some background to this … Mozilla Axes its Privacy-Friendly Location Service - OMG! Ubuntu