just yesterday i asked pretty much the same question on unifiednlp’s github page. the answer i got was that one backend for each type of data is enough - so one for wifi and one for cellular towers or one for both - and using more means either more space needed on the phone - if the data is saved locally - or more mobile internet usage - if an online database is used, like with the ichnea and the apple backend.
on the other hand if you ever end up in a region that is not discovered by one database using another one additionally ciuld be beneficial.
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Well, I don’t know if I made a mistake during installation or what, but I noticed when using LocalWifiNlpBackend an enormous battery drain even in standby (about 30% per hour while normally I have a 10-15% per hour battery consumption).
As I also didn’t understand yet if I installed everything correctly (because I don’t have any advantage in GPS fix) I uninstalled it and deactivated all the backends.
I have no idea what you might have done wrong but for me it works perfectly and without battery drain.
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So the installation steps are those you mentioned in your previous post? Just copy LegacyNetworkLocation.apk (and rendering it a system app) and installing the backends?
I have to try again because the only difference is I also installed UnifiedNlp from F-droid (so I have both NetworkLocation.apk and LegacyNetworkLocation.apk)
I assume you didn’t rename LegacyNetworkLocation.apk to NetworkLocation.apk, am I right?
Thank you! 
Yes thats all I did. I didn’t rename the App and didn’t download the Version from F-Droid.
The backends I use are:
- GSM location B.
- Personal Wifi B.
- GSMNetworkLocationProvider
- Ichnea B.
although atleast the Ichnea Backend is redundant.
maybe you used another backend and that one drained your battery?
oh and one more thing but i explained that before and i think i’m the only one who didn’t automatically do it: you have to turn on wifi&network location access in system settings.
Yes, I’m sure it was LocalWifiNlpBackend because I was able to log the battery drain since its installation and until its removing.
I’ll try your configuration 
Thanks!
When I launch µg unifiedNlp and click on “configure location backends”, the application crashes.
¿Is it normal?
Wifi&network location is enabled (although the description of the option mentions google 
)
I installed all the backends I could find, and OSMand doesn’t find my position. I live in a big city in Spain.
Something must be going wrong 
no that is not normal. my guess: something went wrong with the installation of either one of your backends or the unified backend. you could try uninstalling all backends, see if it still crashes, then reinstall the backends one by one to see wich one causes the crash. if uninstalling the backends doesn’t work you could try uninstalling and reinstalling the unified backend. maybe test it before you make it a system app as well; it shouldn’t work as a user app, but it shouldn’t crash either.
I ran into the same trouble and did a quick research, until I found this. adbd Insecure 2.00 did the trick for me. The error message from adb doesn’t come up anymore and everything works as expected.
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It’s the only backend I am using, and I also started stumbling around with Mozilla Stumbler. 
A lot of blank areas still, where I live, but I’ll map it all. 
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I’m allready in the top 1000 stumblers worldwide
tomorrow I’ll stumble over to swizzerland while helping my brother move there
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Congratulations, Paul!
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GREAT!
Keep up with the good work!
Thanks to @Stefan tip, I think I managed to install unifiedNlp with the technique described in https://github.com/microg/android_packages_apps_UnifiedNlp
I say “I think” because I haven’t had any error doing the adb thing, but the app doesn’t show in my app list. So I can’t enter th app to manage the backends.
OSMand doesn’t find me on the map. I don’t know if it is because my city (Donostia San Sebastian in Spain) is a backend desert or because µg unfiednlp doesn’t work.
Question for people who manage to use µg unifiednlp on a GAPPS-free Fairphone: ¿Does the application show?
Yes it does:
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Gosh. I don’t have that 
Did you follow exactly these instructions with these command lines?
1 Download LegacyNetworkLocation.apk
2 Mount /system read-write (from your PC, call adb root && adb remount)
3 Copy LegacyNetworkLocation.apk to /system/app (from ypur PC, call adb push LegacyNetworkLocation.apk /system/priv-app/NetworkLocation.apk)
4 Reboot (from you PC, call adb reboot)
Yes, did you do, what I did (as explained in post #30)?
Yes I did what you mentioned in your post.
Finally I got it work 
Instead of writing “adb push LegacyNetworkLocation.apk /system/priv-app/NetworkLocation.apk” i did “adb push LegacyNetworkLocation.apk /system/app/LegacyNetworkLocation.apk” and the app appeared ! 
Yes, now I remember, I had to change priv-app to app because Android 4.2.2 doesn’t have the directory priv-app.
Edit: I updated my original post and made it a wiki post for everyone to contribute.