Thank you very much @karry!
You were right, I downloaded offline maps, and now everything works as expected (route is visible on the map).
The great thing (thank you for hint about file where I can add maps) is that I can see this route on added maps (mapy.cz and osmapa.pl) - this is great, and I can use your app without additional android applications!
So the last thing is this pulse in GPX (imported), because I think that adding pulse monitor via bluetooth device to your app is not in your “to do list”
What I see in the created files:
GPX from Kuri/Laufhelden uses “TrackPointExtension” if I see correctly:
<gpx xmlns="http://www.topografix.com/GPX/1/1" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd http://www.garmin.com/xmlschemas/GpxExtensions/v3 http://www.garmin.com/xmlschemas/GpxExtensionsv3.xsd http://www.garmin.com/xmlschemas/TrackPointExtension/v1 http://www.garmin.com/xmlschemas/TrackPointExtensionv1.xsd" version="1.1" Creator="Laufhelden" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:gpxtpx="http://www.garmin.com/xmlschemas/TrackPointExtension/v1">
...
<trkpt lat="50.4237992" lon="19.27443156">
<time>2022-08-24T07:16:54Z</time>
<ele>360.9833984375</ele>
<extensions>
<dir>282.5</dir>
<g_spd>3.50999910126326</g_spd>
<h_acc>3.79009246826172</h_acc>
<v_acc>2.5</v_acc>
<gpxtpx:TrackPointExtension>
<gpxtpx:hr>129</gpxtpx:hr>
</gpxtpx:TrackPointExtension>
</extensions>
</trkpt>
...
GPX from Sports Tracker (I see that also TrackPointExtension is used, but the XML is in general more “dirty”):
<gpx xmlns="http://www.topografix.com/GPX/1/1" version="1.1" creator="Sports Tracker" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd http://www.garmin.com/xmlschemas/GpxExtensions/v3 http://www.garmin.com/xmlschemas/GpxExtensionsv3.xsd http://www.garmin.com/xmlschemas/TrackPointExtension/v1 http://www.garmin.com/xmlschemas/TrackPointExtensionv1.xsd" xmlns:gpxtpx="http://www.garmin.com/xmlschemas/TrackPointExtension/v1" xmlns:gpxx="http://www.garmin.com/xmlschemas/GpxExtensions/v3">
...
<trkpt lat="50.070905" lon="18.420838">
<ele>339.0</ele>
<desc>Speed 13.2 km/h Distance 0.01 km</desc>
<time>2022-07-09T09:41:23.35</time>
<name>2</name>
<sym>Dot</sym>
<extensions><gpxtpx:TrackPointExtension><gpxtpx:hr>122</gpxtpx:hr></gpxtpx:TrackPointExtension></extensions>
</trkpt>
...
If you need more data (or help) let me know.
@rinigus thank you for answer and for all your suggestions, for now your applications (offline maps + Pure Maps) are very helpful when I want to do quick search something on the map (without Internet access)
Regards,
R.