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I have the GPS daemon running as user gpsd:

/usr/sbin/gpsd -N /dev/ttyUSB0 /dev/ttyUSB0

I have gpxlogger running as root:

gpxlogger -d -f /data/%Y%m%d-%H%M%S.gpx

Initially, all what gpxlogger writes is the gpx preamble, but no actual fixes.

gpxlogger starts to log actual fixes, as soon as I run another gpsd client like 'cgps -d' or 'gpsmon'. When this other gpsd client ends, gpxlogger stops to log fixes after some time.

It appears as if gpxlogger is not a "sufficient" client "to make" gpsd provide actual fixes.

For now my workaround is to autostart "cgps -s" in a terminal.

  • For now my workaround is to autostart "cgps -s" in a terminal. – Max Spring Apr 21 at 19:37
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Another closer look into the gpxlogger's manpage revealed to use the -e <export-method> with -l listing all available export methods. So now I invoke gpxlogger this way and it gets the fixes without another gpsd client running:

gpxlogger -e sockets -d -f /data/%Y%m%d-%H%M%S.gpx
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    As you've found your own answer you can accept your own answer as the answer. – Roger Jones Jun 12 at 9:51

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