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Thread: GPS and Accuracy

  1. #1
    Low Bitrate sviyer's Avatar
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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?

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  2. #2
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    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
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  3. #3
    Super Moderator xBrady's Avatar
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    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.
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  4. #4
    I see dead kittens Quattro's Avatar
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    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.
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  5. #5
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    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!

  6. #6
    Constant Bitrate jeffreyd_tx's Avatar
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    Quote 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.

  7. #7
    Super Moderator xBrady's Avatar
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    Quote 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.

  8. #8
    Super Moderator xBrady's Avatar
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    Quote 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.

  9. #9
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    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.
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  10. #10
    Low Bitrate sviyer's Avatar
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    Thanks for your replies everybody.

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