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  • GPS and Accuracy

    Hello,

    I often find my car speedo and the GPS unit showing different speed values?
    I am confused which one to beleive??
    I know that speedometers are over calibrated here in India atleast, but is the GPS precise?

    ----------
    Ford Fusion +
    HP iPAQ 6965
    ----------------------
    Honda City

  • #2
    I'd go off of the car.

    the GPS in the car takes a bit longer to read and calculate and talk with the satelites.
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

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    • #3
      So long as your GPS receiver has a good fix it is precise. But like you said, cars speedos report you as going faster than you are. I'd believe your GPS unit.
      AMD XP 2600+/512MB RAM/120GB hard drive
      Opus 150W/DVD/GPS/7" Lilliput TS/802.11g/Bluetooth
      Installed.


      -GPSSecure- - GPS Tracking
      -AltTabber2.2.2- - Handy touchscreen utility.

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      • #4
        yeah, I've noticed that my car reports about 2 mph higher then the gps output. I'd say it is pretty accurate, but the only prolem is that the gps outputs don't update as fast as your cars speedo.
        Installed
        Asus A7N8X-VM - AMD Mobile Athlon 2400
        512 Ram - 60GB HD - Opus 150w
        Lilliput 7" - Rikaline 6010
        [00000000000001100010-] 98% Completed

        Check Out My Install!!!

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        • #5
          which do you think would hold up in court?

          car spedo or GPS speed?

          My money is on the car.
          Jan Bennett
          FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

          Please post on the forums! Chances are, someone else has or will have the same questions as you!

          Comment


          • #6
            Originally posted by RedGTiVR6 View Post
            which do you think would hold up in court?

            car spedo or GPS speed?

            My money is on the car.

            My money is on the cops radar gun.

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            • #7
              Originally posted by RedGTiVR6 View Post
              which do you think would hold up in court?

              car spedo or GPS speed?

              My money is on the car.
              Which will hold up in court has nothing to do with which is more accurate. If one of the concrete trucks is driving 90 miles an hour and kills someone from one of the customers of the GPS tracking company I work for than GPS. If the guy claims he was going 45 MPH and we have him going 90 MPH, they are going to use our reading.
              For anyone else I doubt you telling a judge that you were really only going 25 MPH based on your cars speedo vs. telling him your GPS said you were going 25 MPH is going to make a difference.
              AMD XP 2600+/512MB RAM/120GB hard drive
              Opus 150W/DVD/GPS/7" Lilliput TS/802.11g/Bluetooth
              Installed.


              -GPSSecure- - GPS Tracking
              -AltTabber2.2.2- - Handy touchscreen utility.

              Comment


              • #8
                Originally posted by jeffreyd_tx View Post
                My money is on the cops radar gun.

                Crap, that took me a long time to reply (was doing something else in the middle.) But that is what I was getting at near the end of my last point.
                AMD XP 2600+/512MB RAM/120GB hard drive
                Opus 150W/DVD/GPS/7" Lilliput TS/802.11g/Bluetooth
                Installed.


                -GPSSecure- - GPS Tracking
                -AltTabber2.2.2- - Handy touchscreen utility.

                Comment


                • #9
                  Speedometer accuracy is pretty spot-on within a few percent. Changing the size of wheels/tires will obviously cause it to be a bit off though.
                  PROGRESS: 20%[++--------]
                  Current Project: OS Config
                  Intel Mac Mini Core Duo running Win XP
                  Carnetix P-1900+PNP cable
                  Xenarc 700TSV
                  Global Sat BU-353 GPS
                  Alpine Sirius Reciever with mitchjs board
                  Car2PC adapter
                  RoadRunner
                  PhoCo

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                  • #10
                    Thanks for your replies everybody.
                    ----------------------
                    Honda City

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                    • #11
                      My gps loses accuracy as I speed up...kinda weird, didn't do that before when I had it hooked up to my laptop (now in carpc)...I think is a cpu/computation issue.

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