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Bu-353 and CentraFuse, Arrow 200 Meters behind

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  • Bu-353 and CentraFuse, Arrow 200 Meters behind


    I have on my notebook installed CentraFuse, and use a BU-353 and Destinator maps.
    But the Arrow in Centrafuse is about 100-200 meters behind, or about 10 seconds at 80 KM per hour.

    Whats wrong, and how do i fix it?
    Can the BU-353 send SIRF data on the USB cable, and does it work better than NMEA?

    Best Regards
    Morten Jensen

  • #2
    Don't have an answer to your problem, but the BU353 can send Sirf data, but the maps in Centrafuse only recognize NMEA data, so that wouldn't help with your issue.
    Have you looked in the FAQ yet?
    How about the Wiki?

    Under normal circumstances, a signature would go here.


    • #3
      How come i can select SIRF in Centrafuse then?
      I dont really care if its use NMEA or SIRF, it just have to work 100 procent, wich it dont, the GPS is useless because the arrow is so far behind.


      • #4
        So it does....
        Most nav software accepts only NMEA data, but it appears the CF engine is different in that regard.

        You can certainly set the BU353 to Sirf mode and see if it makes a difference. I don't know if it will or not.

        I recall at least one other user on these forums with a similar issue. If I remember correctly, they had a bad GPS receiver. They got it replaced and all was good.
        That may or may not be your issue, but it's worth investigating.
        Have you looked in the FAQ yet?
        How about the Wiki?

        Under normal circumstances, a signature would go here.


        • #5
          Do i just use SirfDemo to set it to SIRF data?
          And what settings should i use, baud rate ect?

          Best Regards


          • #6
            BU-368 Solution

            Hey Mate,

            I had a similar problem to you, but i have the new Globalsat Bu-368, the bluetooth GPS one as my old BU-353 died on me.

            Anyhow, i had the same problem, in Centrafuse (uses Destinator) when the gps was set to NMEA mode and 38400 (default for this device) Centrafuse was very laggy.. about a 3 second delay in updates so when your driving, and you need to take a turn, you pass the turn before you notice it!

            I have found a solution to the problem though. Use SirfDemo (google it for a download) connect the GPS Device to the computer then open SirfDemo, select the com port the device is on and the baud rate. Once thats done, in sirfDemo go Action -> Open Data Source. If the device is in NMEA mode, the only window that will be showing data will be the Debug View - NMEA.

            Now, From the Action -> Switch to Sirf Protocol. the program might look like it hangs for a few moments, but it is just setting the GPS device in Sirf mode. Once in this mode, all the other windows should now be displaying information. The Debug wont. So far the device is set in Sirf Mode.

            Next, choose Navigation -> Mode Mask. Check the box which says Smooth Tracking and click Send. You can verifiy if the GPS has this enabled by looking at the Response View (pause the gps output by choosing Action -> Pause Display), Alterinativly choose Poll -> Nav Parameters and see that TrkSmoothMode = enabled.

            Now thats done, go to Action -> Set Main Serial Port and choose the com port and set the device to 57600 (this should be the default in SirF mode anyway)

            Finally, go back into centrafuse and go to the setup section, choose Protocol -> Sirf and Baud -> 57600.

            Go out for a drive and test.

            From what i have found, if i place my bluetooth GPS on the dash near the windscreen, the display GPS position is quite good, it updates my position on the map every 1 second or so, much better than the laggy version i had perviously! if i place the device near my cigi lighter near my gear shifter, then it still updates pretty well (~1 second) but is a little more laggy when i take corners, it initally sees me taking a corner, then goes around said corner, finally figures im about 75m from the corner and adjusts my position correctly. Once im on a straight though, it works pretty well.

            Mind you these settings worked well with my Bluetooth GPS (new one) but it should be the same for the BU 353. My old setup was just as laggy, but maybe a little less than my Bluetooth before i sorted it out with SirfDemo, (2 second lag opposed to 3 second with Bluetooth).

            Hope that made sense, and hope you get it sorted!



            • #7
              I have a similar problem with my bu-353 and destinator (both 6 & 7). I'm starting to wonder if position in the car is part of it, and I'm not just talking about reception. Currently its located in the trunk. I wonder if I moved it to the very front of the car, almost a car length distance forward, whether this would be enough to correct the lag.


              • #8
                It's probably not related to NMEA or Sirf protocol (no matter what, they update @ 1Hz) but the TrkSmoothMode option. Isn't that use to filter out position so it doesn't report small moves (accuracy/hdop related, mostly) ?
                Now Galileo is real. Muhahahahaha :p


                • #9
                  cant seem to get this to work with my device. tried From the Action -> Switch to Sirf Protocol several times and it does nothing, even after waiting 2 or 3 minutes.... i have no idea what to do and am totally frustrated as... funny thing i was using same gps receiver on my older carputer without a problem.


                  • #10
                    Just wanted to let you guys know I fixed a BU-353 lag which showed up while on vacation. On my trip down south in the wife's car + asus netbook, everything worked great. I was on the beach for a week with the GPS unplugged and the netbook was doing other things. Well on the way back I plugged the GPS back in and noticed the lag in both iGO and iGuidance so I knew it was not the GPS software. I doubted it was the actual GPS hardware since it worked fine a week ago. Turned out to be the OS layer (stupid XP) The first time gps worked good it was using virtual com port "3" according to windows. On the return trip I noticed it configured itself to use virtual com port "6" and after that it worked like crap. Anyways I went to device manager, deleted the virtual com port "6" and unplugged the GPS puck. Plugged it back in and it reverted to com port "3" again and viola it works again.

                    So just wanted to share my solution, since we are using a weak OS (XP) I don't think it likes virtual ports over 3. So those with problems see what virtual port windows has assigned to your GPS. I'm going to try windows 7 on this little netbook to see if it makes a difference.
                    Build Things, it keeps your brain busy.

                    AutoPC v1 (Retired) - AutoPC v2 (in progress) -


                    • #11
                      Is there something better then the BU-353? What is the absolute best out there?


                      • #12
                        Tony, even though BU-353 has been out for about 5 years now, it still is a very good performer. The occasional issues you may hear, may be specific to the particular installations, and may have very little to do with the quality of the GPS unit.

                        If you are really set against BU-353, have a look at Quarz Q818X. It is based on the MTKII chip, which may even be a dB or two more sensitive than BU-353's SiRFstarIII chip. But keep in mind that BU-353 is one of few units that are weatherproof and w/magnetic base. By placing BU-353 on the roof of the vehicle, you will gain more than a dB or two of signal strength.

                        Qstarz Q818X can work at 1, 2, 3, 4, or 5Hz. Some software takes advantage of this (eg. Garmin Mobile PC), and some doesn't (iGuidance).

                        Qstarz Q818X is a dual, Bluetooth and USB, GPS receiver. You have the option to use BT or USB, which ever suits your needs.

                        But pretty much any modern GPS unit has a very decent performance these days.

                        In BU-353 we trust.


                        • #13
                          THanks for getting me up to speed

                          I've read that it's old and since I seen they go for under a hundred bucks on ebay, I figured they was old and out dated.

                          Thanks for answering.


                          • #14
                            Any verified solution to the lagging found? I'm having this problem too.
                            I've read a bunch of threads and here is a summary what I've seen suggested as a fix, but never confirmed by more than one person:
                            • Configure GPS to com port <= 3 ??
                            • Enable track smoothing function on GPS with SirfDemo (maybe disable as that makes more sense to me)
                            • Mess with Sirf mode vs. NMEA mode (but I'm using iGuidance) using SirfDemo
                            • Limit the # of streams of NMEA data being sent..using SirfDemo?
                            • Set GPS to send non-NMEA data every 5 seconds instead of every 1 second...SirfDemo? (xport has a feature to filter non NMEA data...maybe this would work?)

                            I wonder if some of these solutions inadvertently toggled the GPS into a default state, and if they did how did they get changed from that state in the first place because it can happen again. My GPS used to track just fine...

                            I'm hesitant to start hacking around with SirfDemo because I have read it grenaded a receiver or two.

                            I'll try Xport's filter NMEA data setting first as that seems harmless.


                            • #15
                              GPS Lag

                              I had the same problem during my final evaluation of my truckputer. I ended up switching to GPSGATE. I ran the eval version through normal driving as well as some long distance trips (>100 miles) and it ran without incident.
                              I really believe in freeware, but sometimes paying for something that actually works makes the effort worth while.

                              Spend $39 on GPSGATE. I'm sure you probably spent more than that on your carputer up to this point.