[Om2008.9] How to use GPS?

Matthias Apitz guru at unixarea.de
Fri Oct 31 13:15:39 CET 2008

El día Friday, October 31, 2008 a las 11:05:46AM +0000, Alastair Johnson escribió:

> >Any idea about this problem:
> >
> >I'm using tangogps-0.9.3-r1 and  gpsd-2.34-r9 in the GTA-02 FreeRunner
> >with Om2008.9; sometimes I get (with clean sky) a Fix after some seconds,
> >some times not even after 20 minutes in the same location; the status
> >line of tangoGPS shows a lot of sattelites but none used of them, for
> >enexample 12/0/0.0 What could I do? Thx
> I used to see odd behaviour a bit like that from gpsd when the gps was 
> powered up after gpsd was started. To save a bit of power I took to 
> running gpsd only while the gps was powered up, starting and stopping 
> both from a script. After I started doing that I stopped seeing the odd 
> behaviour, but it could have been coincidence as there was a lot going 
> on around gps in those days.

The 'gpsd' is launched at boot time by the script /etc/init.d/gpsd; I've
added support for power-on and power-off in the script before 'start'
and after 'stopping' the 'gpsd'; as well I've expanded the file
/usr/share/applications/tangogps.desktop to restart 'gpsd' before
launching 'tangogps' and to stop the 'gpsd' after end of 'tangogps' (to
save power) by this line:

   Exec=/etc/init.d/gpsd restart;tangogps;/etc/init.d/gpsd stop

this worked well in the sense of the processes itself (I've checked this
in the log files and with ps(1)); but after this change in
/usr/share/applications/tangogps.desktop the above described behaviour 
started to occur; I've revoked now the change and don't touch 'gpsd'
anymore after it was started at boot; it now works again as one expect;

it seems that 'gpsd' needs its time to sync with the stars (the
sattelites) and/or 'tangogps' does not like a freshly booted 'gpsd';
with more time I will debug the logs deeper ...

Matthias Apitz
Manager Technical Support - OCLC GmbH
Gruenwalder Weg 28g - 82041 Oberhaching - Germany
t +49-89-61308 351 - f +49-89-61308 399 - m +49-170-4527211
e <matthias.apitz at oclc.org> - w http://www.oclc.org/ http://www.UnixArea.de/
b http://gurucubano.blogspot.com/
A computer is like an air conditioner, it stops working when you open Windows
Una computadora es como aire acondicionado, deja de funcionar si abres Windows

More information about the community mailing list