Heading at slow speed

Submitted by Sven on Sat, 02/16/2008 - 15:36.

Hi,

I just read in the update history:

  • Added code to support GPS receivers that fail to report a heading for slower speeds

    • Especially because I asked for such a feature, much thanks for implementing it!

    I will test it tomorrow, but I don't find an option to activate this feature. How is it implemented; is it a default?

    Thanks again, I'm very happy that I can use now your great software with my buggy Keychain 2000-GPS.

    Greets,

    Sven

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    I was overjoyed when I saw

    Submitted by Jaroslav Benkovsky on Fri, 04/25/2008 - 01:00.

    I was overjoyed when I saw that update too, but then I found it's something else than I was hoping for. The problem common to many Sirf III GPS units is Static navigation - when On (as is default on my Haicom BT 406 dongle and many other models), it reports the same position unless the speed is over some threshold or the real position changes too much. I think it's either the same or similar problem to yours.

    The static navigation can be turned Off (although it's reportedly risky on some models(*)) by switching the GPS to SiRF protocol instead of NMEA, issuing appropriate command and switching back to NMEA.

    So when I saw that there are now options to use SiRF protocol, I hoped it could do this trick, but apparently not - when I setup the GeoNiche to use SiRF protocol, it ceases to get fix from the GPS and I have to powercycle the GPS and switch it back to NMEA.

    Am I doing something wrong? I would really love if GeoNiche allowed me to switch static navigation Off, I have to do it from my notebook (**) now each time I switch the GPS off for some time.

    Pretty please... :-)

    (*) The problem might be caused by unability to switch back to NMEA or whatever
    (**) The program which can do the switch is open source, it's sirfmon from the gpsd package

    Send me an email if you need more info, thx :)

    Heading at slow speed

    Submitted by RayDar on Tue, 03/11/2008 - 22:17.

    I am glad it works better now at slow speeds. I hope it is at least now usable.

    I will investigate adding a preferences item. The earliest that could be implemented is V1.50.

    ((RayDar))

    I tested on some tours now

    Submitted by Sven on Mon, 03/10/2008 - 16:42.

    I tested on some tours now the new behavior. It works better with my receiver, but not perfectly.

    I had a closer look to the problem of the MTK-Receiver. Sometimes it tells a bearing of 0° a while (I think after a rest) and sometimes it freezes the bearing, therefore it tells the same bearing all the time (I think this is while traveling less than 5 mph).

    I don't now your algorithms to detect this conditions, but perhaps it's better to implement an option for this receivers, so that the bearing is calculated permanently via the coords.

    Thanks for your great work & Greets,

    Sven

    Heading at slow speed

    Submitted by RayDar on Sat, 02/16/2008 - 22:53.

    There is no configuration item. GeoNiche automatically detects this situation (where a GPS receiver fails to report a heading at slow speed) and compensates by computing your heading using previous and current coordinates. For receivers that don't have this problem, GeoNiche uses the heading information transmitted by the GPSr.

    ((RayDar))