maybe I have misunderstood then. From your initial response I understood that the gps receiver of the gta04a4 would have a lower sampling frequency than the gps receiver of the gta04a5 due to some hardware wiring and as I you stated in the gta04a5 anouncement the gta04a5 can provide now with the hardware fix a
* the GPS receiver can provide a 1 second impulse interrupt to the CPU so my conclusion was that the gta04a4 cannot sample at with 1Hz but must be slower. I haven't had the time to change my gta02 to an gta04 so I could not test the difference myself, but I remember reading the thread [1] it was re- ported that the gta02 gps was capable to sample at much higher rates (4Hz standard, max 20Hz reported). Sampling at 1Hz at 60km/h means an update every ~17m which in most navigation situations should be ok, but if you have complex crossings with more than two alternative lanes then the lag becomes a problem. best regards robin [1] http://comments.gmane.org/gmane.comp.handhelds.openmoko.community/62642 _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community