On 16/04/12 20:26, Mitja Kleider wrote: > Hello, > > I have a few questions regarding outdoor GPS devices: > > * Are you satisfied with the available devices? What would you change first? > * If there was a device with open source firmware, would that be an > important feature? I have mostly one concern with available GPS loggers: the varying accuracy. We don't need the 2-3cm accuracy of a surveyors GPS, but a little bit more would be helpful. So the two important features would be
- Show reliably how accurate the position is. Unlike a navigational GPS, it's of not much use to have quickly a fix which is 100m away. High sensitivity brings multipath reception which can make a track useless for mapping. In other words: a mode which only uses a reliable fix. - differential GPS. If you want to record some details, positioning a gps on a known point can give a huge increase in accuracy. This feature would not be that hard to implement, and I am sure some technical university would gladly make a project out of it, if we could get access to the internal measurements of the chip set and not only the fully processed NMEA data. Datendelphin _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
