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my interest is, to get a more precise GNSS position for the track recording as it is done by the usage of the mobile phone internal GNSS receiver. Background is, that during my hiking tour, specially in mountain, valley and forest regions, the tracking of the position and related altitude is not as precise as I want to have it. One good example is, if you are standing close to the edge of a deep hollow and the measuring point jumps between bottom and top, the result is a altitude calculation, which is far from real.

In a first step, I bought a GNSS receiver from Adrusimple, which allows together with an RTK helix antenna very precise measurements, if the programming is done well, which I worked out over several weeks. I'm using this equipment since month now and I'm really happy with the related results. But: The costs are really high, about 300€ and not really an option for maybe other interested user.

So in the second step, I tried to reduce the cost by using catalog single components and a cheaper U-Blox M9N GNSS chip. After a lot of testing and programming, the new receiver delivers nearly the same positioning quality as the former one. I will now do some further optimizations on the housing and tests in mountain regions. 
If you like, I will keep you informed and show some comparison measurements with simple mobile phone logging afterwards.

I'm looking forward to get some feedback from you side, if you have same experience and maybe interest to get further information details.



ich bin auf der Suche nach Gleichgesinnten, die auch nicht zufrieden mit der Qualität der GPS-Positionsdaten Ihres Mobil-Telefons sind, bspw. bei der Nutzung von Locus als Outdoor App.

Ich habe mich daher intensiver damit beschäftigt und nun nach einigen Monaten einen externes Modul entwickelt, welches deutlich bessere Daten liefert.

Ich wäre jetzt für mich damit zufrieden, allerdings könnte ich mir auch vorstellen, es für die breitere "Masse" zu optimieren. Voraussetzung wäre natürlich ein generelles Interesse.

Also: Meine erste Frage wäre daher: Besteht überhaupt der Bedarf, oder sind alle mit der aktuellen Präzision, die ihr Handy liefert, zufrieden?

Alles weitere Fragen würden sich den Rückmeldungen anschließen, wie Details, Kosten, etc.

Ich würde mich über Euer Feedback freuen.

Danke und Gruß