@thomas-voss As I can see I didn't explain it well.

With <So the phone was sometimes trying to connect to AGPS to know the
satellites positions when I was travelling in 'dark zones' for
satellites.> I mean that when you are travelling in that 'dark zone' the
GPS doesn't receive positions. If that 'dark zone' is short, when you
exit the phone finds the satellites position easily; but if that zone is
long when you exit it tries to connect to AGPS to determine the
satellites positions and is then when it fails. I.e. if you cross a
short tunnel the phone doesn't need AGPS when exit but if you cross a
long one it needs it and the location services fails.

There are only my thoughts after analyse what I have observed.

It happens either if you have wifi enabled or only phone network.

Apart of that:
   - I haven't tried if the phone gets positions with only GPS. I tried it one 
year ago and it didn't work but I haven't tried it again.
   - I tried today to put the phone in plain mode, clear .cache, reboot and 
open SensorsStatus. It has received positions in about 2 minutes (without wifi 
nor phone network, i.e. without AGPS).
   - I'll try to travel in plane mode (with 2 GPS apps opened) when I have a 
chance.

I hope this to be useful. :-)

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to location-service in
Ubuntu.
https://bugs.launchpad.net/bugs/1468020

Title:
  Two GPS compatible apps conflict and loose GPS

Status in Canonical System Image:
  Incomplete
Status in location-service package in Ubuntu:
  Incomplete

Bug description:
  Meizu MX4 with Ubuntu 15.04 r2

  1. run OSMscout (for example)
  2. drive/cycle a distance to confirm that GPS tracking is working fine
  3. run the camera app (for example)
  4. take a few photos (they'll be tagged with GPS info)
  5. switch to OSMscout
  6. drive/cycle and OSM will now not update from GPS

  Haven't tested this with other apps as yet, but it seems that one app
  will take control of the GPS and not hand it back. (For want of a
  better explanation.)

To manage notifications about this bug go to:
https://bugs.launchpad.net/canonical-devices-system-image/+bug/1468020/+subscriptions

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