Question about OSM geolocate

Good day.
Sorry, may be stupid questions…

I don’t understand working with geolocation equipment at. I open Device - Overview. I see location received from the device (syslocation) and lat/lng - n/a. I open the map and see that the map is positioned at [0.0]. Forcibly changing the device’s cation to an existing address - and nothing changes: the map is also positioned at 0.0. what am I doing wrong?

second question:
there is such a mention in the code

app/ApiClients/NominatimApi.php: protected $ base_uri = ‘’;


I have my own OSM geolocation server. the nominatim works on it. how do i specify it for librenms?