Trackpoints missing

When using Oruxmaps (4.8.37) for track logging (Road Bike, Galaxy i5800) I observe two strange things:
1. The automatically saved GPX-File ends before the track ended that means the last part of the track is missing!
For that I export the track manually then it's correct.
2. In the exported track often there is a lack of several minutes visible as straight line when reloading the track. This lack is not only in the exported track but also in the database.
I have the feeling that this happens especially when cycling downhill fast.
My GPS settings: time interval 2 sec, way interval 10 m.
During cycling the actual track on the screen looks always perfect (from start to end) so I think I do not loose my GPS signal.

Any idea why trackpoints are not saved for several minutes?

steffke

Hi, same problem here, (only problem 2), but for me it doesn't happen only in downhill. My gps settings are 1 sec 0 meters.
Also for me during the cycling the track looks perfect, but once saved the lack of trackpoints is not only in the exported track but also in the database. I also use an ANT+ HR monitor and when the track points are missing from the gps track, there are also no HR points.
This happens with 4.8.36 and with 4.8.45.
Fabrizio

Hi, here's an example of a couple of minute data loss.
https://docs.google.com/open?id=0B0gTg2GedomPMnNEcWNMWnl4d28
As I said before, at the end of the ride the track on the map was perfect, but in the exported gpx and also the track in the database there are a lot of missing points (this time in a fast downhill).
Please Orux, can you fix it? If you need more info or more test I'll be glad to help.
Fabrizio

Edit:
I made some digging in the gpx file:
The problem is here:

Code:

<trkpt lat="45.53956357" lon="10.25824451">
<ele>472.1163</ele>
<time>2012-06-25T[b]18:45:3518:45:35Z[/b]</time>
<extensions><gpxtpx:TrackPointExtension><gpxtpx:hr>129</gpxtpx:hr></gpxtpx:TrackPointExtension></extensions></trkpt>
<trkpt lat="45.541228" lon="10.23729251">
<ele>266.55426</ele>
<time>2012-06-25T18:49:37Z</time>
<extensions><gpxtpx:TrackPointExtension><gpxtpx:hr>140</gpxtpx:hr></gpxtpx:TrackPointExtension></extensions></trkpt>

As you can see 4 min and 2 seconds are missing, and the last point before the interruption has a problem in the time field.

I examined the loss of data in more detail and it is not only downhill. An example of trackpoints lack:

Code:

<trkpt lat="47.97293433" lon="7.99514063">
<ele>459.62753</ele>
<time>2012-06-16T14:45:53Z</time>
</trkpt>
<trkpt lat="47.97997738" lon="7.93674771">
<ele>408.50436</ele>
<time>2012-06-16T14:55:57Z</time>
</trkpt>

As you can see, more than 10 min are missing, but there is no problem in the time field as in fabrylamas example.
What I still don't understand is that the recorded track looks perfect (no loss of GPS signal or?) but the track in the database is corrupted. Are the data first all saved in the cache and is there then an import problem into the database? How does this work?

I examined other tracks and sometimes I have the error in the time field, sometimes not.
I'm thinking it could be all due to a write error to the SD, I'll try with a different one...