@Stefano , @Lakotaubp , thank you very for your replies!
Have another question though. Yesterday updated my OP3T to latest available version and tried to acquire my location using Pure Maps application. However even after 20 minutes waiting, Pure Maps still could not acquire the location (it has the permission, I double-checked). In the list of what should work on OP3, GPS is listed as 'working'. Does it really work? Are there any ways to make sure that it really works? Mb some console utility to access the GPS module and get a raw position from it as some RINEX file or smth?
It works on my 3T. I set it up ages ago and can't remember how long it took to make the location, although I think it was quite a long time; maybe more than 20 mins! I opened the app just now and it displayed my local map so I tried to make a navigation search. In the navigation window of the app in the 'From current position' box the little spinner shows it is searching, but nothing seemed to happen. So I checked the phone settings to make sure location detection was enabled and found in 'System Settings > Security & Privacy > Location' that Pure Maps was on. But from the pull down menu of settings from the top bar 'Location Detection' was toggled off. Maybe it is the same for you?
After I toggled the second switch it did not take very long to be detected. Good luck.