On Sat, Sep 21, 2013 at 02:41:12PM +0200, [email protected] wrote:
> Last time I reported some paramters I intend to experiment; I haven't > done it till today because in the meantime I had to return the gps > receiver to the manufacturer due to obvious firmware/software bugs. I > decided to wait until ublox-7 based USB receivers appear (eg. Navilock > or such). get some NMEA tracks to simulate a movement, navit will read the file instead of a real GPS (vehicle,source). In fact it is probably best to generate some to test exactly the cases that you want, should be much better than driving around and trying to do software development at the same time :) > Yes, once per second: it did output GSA, GSV (for each visible > satellite, i.e. 10-12 sentences), GLL, GGA, RMC, VTG sentences once in > second. (Maybe too much for a 9600bps 8N1 RS232/USB-connection?) > Anyways, as navit apparently only uses GLL and VTG, everything else can > be turned off and then the transfer rate increased. Further, as 50 kmh > city speed is 13.8 m/s so 13 metres is an unavoidable lag at 1Hz > positions rate if navit does not implement some velocity prediction and > use that instead while painting the map? in theory navit does cater for GPS lag, see vehicle lag attribute http://wiki.navit-project.org/index.php/Configuration/Full_list_of_options But I surely hope your next GPS will be a lot better, iirc my poor arm5 device is doing 3-10 GPS updates:) > As next I'll try to take a look at OpenGL renderer besides QT4-based > graphics (not that I suspect QT4 being too slow). MacOSX 10.4 has > standard OpenGL+GLUT installed by default but the ./configure-script > does not find that. Then, I use the standard 'say' OSX-command for > speaking purposes, don't know yet if this can be tuned too (or see if > navit gets faster if turning off the "speaker"). you can play with the follow parameter to see if that helps. Richard --- Name and OpenPGP keys available from pgp key servers ------------------------------------------------------------------------------ LIMITED TIME SALE - Full Year of Microsoft Training For Just $49.99! 1,500+ hours of tutorials including VisualStudio 2012, Windows 8, SharePoint 2013, SQL 2012, MVC 4, more. BEST VALUE: New Multi-Library Power Pack includes Mobile, Cloud, Java, and UX Design. Lowest price ever! Ends 9/22/13. http://pubads.g.doubleclick.net/gampad/clk?id=64545871&iu=/4140/ostg.clktrk _______________________________________________ Navit-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/navit-users
