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icon TrekBuddy
www.trekbuddy.net
Outdoor companion.
  • internal / bluetooth / simulator GPS
  • offline raster maps
  • smart GPX / raw NMEA logs
  • waypoints and simple navigation
  • custom views
  • MIDP and Symbian phones
  • Blackberry
  • Android
Visit wiki to see all features, guides and howtos. Project tracker.

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Ranger



Joined: 12 Dec 2006
Posts: 6011

PostPosted: Wed Jun 03, 2015 9:37 pm    Post subject: Reply with quote

What is visible in log - fix loosed two times, from 16:06:44 to 16:08:34 (see pict below, place shown) and at 16:16:21 for 7 sec.
It explains unexpected position jumps you observe, when phone looses position. Sorry, apps couldn't repair such no gps fix cases.
What more is interesting in nmea sentences - phone just shows fix type 2D all times
$GPGSA,A,2,21,25,31,,,,,,,,,,2.2,2.0,0.9*3E
$GNGSA,A,2,21,25,31,,,,,,,,,,2.2,2.0,0.9*20
$GNGSA,A,2,69,73,74,85,,,,,,,,,2.2,2.0,0.9*23
even if number of sats is enough for 3D, ie
$GPGSA,A,2,05,20,21,25,31,,,,,,,,1.4,1.1,0.9*3E
$GNGSA,A,2,05,20,21,25,31,,,,,,,,1.4,1.1,0.9*20
$GNGSA,A,2,69,73,74,85,,,,,,,,,1.4,1.1,0.9*24
Only phone producer knows what means this game Smile
BTW, there are a lot of peoples searching best practices for SGS4 fixing, ie
http://androidforums.com/threads/gps-fix-dummies-guide.761247/



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Peter Atanasov



Joined: 13 Sep 2007
Posts: 25
Location: Bulgaria

PostPosted: Sun Jun 07, 2015 11:45 am    Post subject: Reply with quote

1. I made several tests in Trekbuddy with maps with another projections, ewerithing is OK, problem is only on Pulkovo maps.GPS on SGS4 and Trekbuddy works fine.
2. Possible explanation of signal loos in nmea log is that I have been in a building. In my new test with Mercator maps I enter in building too but trail and GPX are OK.
I think that problem is with Pulkovo maps and Trekbuddy and SGS4/Glonas?/
What is the general difference between these 2 projections?

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Ranger



Joined: 12 Dec 2006
Posts: 6011

PostPosted: Sun Jun 07, 2015 12:13 pm    Post subject: Reply with quote

You mean Pulkovo 42 (2) vs WGS84/Mercator ? Not too big, just datum shifts in position, regular way.
Difference between maps can be indeed another, ie support of png map tiles vs jpg in phone, size of tiles, etc.
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fobo



Joined: 19 Sep 2009
Posts: 17
Location: Kielce

PostPosted: Fri Jul 03, 2015 6:26 am    Post subject: Reply with quote

Could use a function that display a trace after reading the information on the track type: the total length, start time, end time, total traveling time, etc.
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guest



Joined: 08 Oct 2006
Posts: 4716

PostPosted: Sun Jul 26, 2015 7:46 pm    Post subject: Tracklogs not saved Reply with quote

In Android 5 whenever you try to start a tracklog you get the message ""Failed to start tracklog: file:///storage/externa_SD/KTrekBuddy/tracks-gpx/....gpx java.io.IOException: open failed: EACCES (Permission denied).

Permissions to write to SD-Card seem to be granted to the app, nevertheless this error!!??

Is there any workaround for the problem? The above hint to shift to internal memory is not feasable as the map-directory is much too big....
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Ranger



Joined: 12 Dec 2006
Posts: 6011

PostPosted: Sun Jul 26, 2015 8:22 pm    Post subject: Re: Tracklogs not saved Reply with quote

guest wrote:
Is there any workaround for the problem?

Yep, old one well known Smile
Leave atlas on SD, load it and set as default ... No problem at all Wink

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