For general information:

I got 2 new ROM versions per OTA within a few days.
20180612 and a little later 20180711
For both versions only "some small bug fixes" were announced.
The state of the security patches has not changed. It is still 05.Feb 2018.

I received version 20180515 via OTA. Now I have found at least 2 apps that I certainly haven't installed myself. On the one hand "infoHub", apparently a news and stories collector. On the other hand, an app called "IDroi Channel Provider", of which I don't even know what it is in...

You are a little bit wrong. There was a total of 7 additional apps. The 5 you have already mentioned, and a app named Duo, and YouTube, this app i have never installed before. Duo Google Drive Google Play Movies & TV (Google Play Filme & Serien) Google Play Music Hangouts Photos (Fotos) YouT...

The security patch level has not changed. The stand is still March 5, 2017.
Why?

Hi, i am from Berlin Germoney. For my GPS-Test i use the app "GPSTest" from "barbeauDev". The only change is in settings "Use GNSS APIs". GPS-Test-Settings.jpg old GPSListener: GPS-Test-GPSListener.jpg here are GPS 1 - 30 , GloNaSS 65 - 83 new GNSS APIs: GPS-Test-GNSSAp...

My "Factory Test" looks:

Not "GyroTest" , you need "Gyrocalibration" .

Unter Android 6 lief GPS problemlos. Die amerikanischen GPS-Satelliten wurden nummeriert von 1 - ca. 32. Die russischen GloNass-Satelliten wurden von etwa 69 an aufwärts nummeriert. Nach dem Update auf Android 7 20161226 kam die Nummerierung der GloNass-Satelliten durcheinander. Sie waren von etwa 1...

To calibrate gyroscope try this:
-go to Factory Test (call *#87#)
-single test
-scroll down
-gyrocalibration

I hope it will help.

To calibrate gyroscope:
call *#87#
single Test
scroll down
gyrocalibration

I hope it will help.