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Thread: SPEED is WAY OFF !!!

  1. #1
    Maximum Bitrate Don 944 LA's Avatar
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    SPEED is WAY OFF !!!

    I have a Magellan Map 410 sitting right next to my Touchscreen. I have used it for years in past vehicles as well due to wierd gearing and tire sizes. I am totally confident in it's speed accuracy. My 944 has an inoperable speedo, so I use the Magellan for a speedo.
    Anyway, Map Monkey seems to be off by about 10mph while going under say, 40 mph.. and occasionally continues to say 30mph+ when I am stopping/stopped.

    I am also using Compass to split the Com port. Could I be getting some lag in the data stream. I am forwarding to about 5 ports.

    Don

  2. #2
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    Speedos on cars are meant to be 10% differnt to the actual GPS speed, if you are going 30mph on your speedo your actually going 27mph.

  3. #3
    Well, He asked for it. WebDog's Avatar
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    Quote Originally Posted by World705
    Speedos on cars are meant to be 10% differnt to the actual GPS speed, if you are going 30mph on your speedo your actually going 27mph.
    lol, not in my car...

    If im going 35 im really going 40... if im going 65 im really going about 75... haha.
    1990 Jeep Cherokee
    2000 VW Golf TDI 4dr
    2005 VW GTI MKIV - SOLD

  4. #4
    Constant Bitrate
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    Let me get this straight .. You're using the Magellan to drive MM, (and other software too, from what I gather) and MM is showing a different speed to what the Magellan's screen does?

    First thing to do is to turn off xport and compass, and use MM to connect directly and see if you still see the same

  5. #5
    FLAC ShawJohn's Avatar
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    Quote Originally Posted by World705
    Speedos on cars are meant to be 10% differnt to the actual GPS speed, if you are going 30mph on your speedo your actually going 27mph.

    Wrong
    Speedo's are allowed to over read by as much as 10% but it would be illegal for it to under read. ie. when doing 70mph on speedo GPS will read something between 63-70mph

    VW/Audi/Seat/Skoda speedo's all over read by exactly 9% to keep them legal but it means you sevice them more often, don't keep them as long, and so buy a new one sooner A 70k mile car has only really done about 64k miles in actual fact. And would probably have had one more service than required.
    Crafty gets do it to make more money
    I don't know whow many pull same trick but this was varified by my bro's Road Angel 2, and my bu-303.

  6. #6
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    webdog. i guess you had new size wheels added?

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