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Thread: USGlobalSat GPS/Route 66 w/Mac mini

  1. #21
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    Quote Originally Posted by davebateman
    ive got the same prob, just installed 2004, i had 2002 running fine but wanted the newer updates. 2004 takes like 20 seconds to catch up with me, thats with a bu-303 on a 1.3 powerbook with 768 ram!

    it really ****ed me off, im gonna try the gps unit in other places tho. it was on my windscreen today, will try the back.
    Talking about really ****ing me off- I have a powerbook 1.5 with 1.5gigs of ram and all the tiger updates and the newest version of Route 66 and I upgraded to the BU 353 thinking it was the receiver. Still have like 20sec lag when driving. Can't even believe this!

  2. #22
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    Quote Originally Posted by kwik18t
    Talking about really ****ing me off- I have a powerbook 1.5 with 1.5gigs of ram and all the tiger updates and the newest version of Route 66 and I upgraded to the BU 353 thinking it was the receiver. Still have like 20sec lag when driving. Can't even believe this!
    Are u sure u downloaded the latest version (build 4)?

    This update provides the following improvements:
    - enhances support for Mac OS 10.3.x ("Panther")
    - changes the GPS refresh rate to one second (real-time GPS)
    - prevents the application from crashing when used with GPS for a long time
    - extends the GPS baud rate options
    - fixes several minor bugs

    download update

  3. #23
    Constant Bitrate MacMobile's Avatar
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    Quote Originally Posted by kwik18t
    Talking about really ****ing me off- I have a powerbook 1.5 with 1.5gigs of ram and all the tiger updates and the newest version of Route 66 and I upgraded to the BU 353 thinking it was the receiver. Still have like 20sec lag when driving. Can't even believe this!
    GlobalSat Web Site does mention that BU-353 and Route66 does not work well with Tiger

    http://www.usglobalsat.com/item.asp?itemid=52

    That's why I went back to 10.3.9 but since then I have install Route66 on Tiger on my iMac G4 800 with BU-353 and the time on the GPS status does not seems to lag. The only thing I change was that I check the USB driver in System Preferences -> Networks -> Network Port Configuration. I have read that from another GPS manual from GlobalSat. I know It does not make sense but it seems to works. I can't try it in a car.... but with your Powerbook your should try it.

    It is fast and probably a lot easier than to go back to 10.3.9. Sometime, I have the lag problem but I seems related to USB hub problem. I have a lot of USB device (PowerMate, iMic, radioSHARK, Touch Screen and BU-353 GPS) and I don't think they all work well together.

    Good Luck

    Franco
    Help me keep my web site up to date.
    Mac-Mini in Passat

  4. #24
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    This may help with GPS lag..

    I recently bought R66 for pan-US trip. Could not test it in Europe (other than quick GPS test) so first real test was when I took my rental car out of JFK and started following the route I created during flight. The GPS tracking stopped in few minutes and then it took some time to figure my way out of NY.. I'm using PowerBook w/ OSX 10.4.2.

    Problem seems to be that R66 is reading pseudo serial port too slowly and OSX buffers data so R66 gets progressively older NMEA messages until the buffer is full and GPS tracking fails. With my TomTom bluetooth unit R66 fails in a few minutes. My old Garmin Etrex Vista works better but tracking lags tens of seconds which is a bit annoying.

    I created a little shell script which flushes the buffer every ten seconds. R66 will loose a few updates but at least it is never more than few seconds behind real time. With this modification I have succesfully found my way from New York to Louisville without touching paper maps (don't arrive Louisville on Sunday - this town is so dead on Sundays that I was bored and started searching the web for help and found this thread).

    The script is in attachments. You need some shell skils to use it, unfortunately. Unzip it to your home directory, change the device from /dev/cu.TomTomWirelessGPSMkI-1 to whatever you are using and run it as root from terminal (sudo gps_flush) after you have started R66 and GPS tracking.

    Hope this helps.
    Attached Files Attached Files

  5. #25
    Constant Bitrate MacMobile's Avatar
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    Quote Originally Posted by vode
    ...until the buffer is full and GPS tracking fails
    ...I created a little shell script which flushes the buffer every ten seconds.
    It seems you have succeeded where Route66 support fail.
    I was one of the many who wrote them about buffer and delay.
    Have you wrote them about that simple solution?

    In iStumbler with the GPS plugin installed, there is an option:
    Drop bread crumb every x minutes,
    Does this option is doing about the same thing as your scripts?
    I guess it should not be too hard for Route66 support team to make a small patch to do what your script is doing.

    I also notice that some program use CU. and other use TTY. with different results.

    I will try your script tomorrow night if I have the time but I have to reinstall Tiger first.

    Thank you vode

    Franco
    Help me keep my web site up to date.
    Mac-Mini in Passat

  6. #26
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    Quote Originally Posted by MacMobile
    It seems you have succeeded where Route66 support fail.
    I was one of the many who wrote them about buffer and delay.
    Have you wrote them about that simple solution?
    I'm still on road (in Colorado now) and do not want to fight with customer support right now - maybe when I come back home. The workaround I made is ugly but works for me, so I can concentrate on my trip. There really should not be need for this kind of hack anyway - R66 should just be able to keep up with the data GPS is sending. I think it actually requires more effort to code it so that it won't keep pace..

    If you want to see what is going on just run as root

    cat /dev/<gps device>

    while R66 is tracking. In my case the cat command prints quite a lot of NMEA data because R66 is not reading it quick enough. If you wait a few minutes before starting "cat" you can see how much data has been buffered. Next switch to gpsutility and do the same - cat does not print as many lines if any because gpsutility is quicker to empty the serial buffer.

    That's what I think is going on here. I don't know what istumbler is doing.

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