: Another tech question

Randy Grein randygrein at comcast.net
Mon Oct 29 08:09:47 PDT 2007

I'm not convinced, but then I'm not the one using it. We have a  
published uncertainty in one instrument (the speedo), an unknown  
uncertainty in the GPS and a big discrepancy in measured speed. I  
work, and have worked with many electronic instruments - people tend  
to trust them because they're hi-tech, or because they read to 3  
digits, or because they're new. In reality they're no better than  
what they are replacing, they just have different places error creeps  
in. Comparison against a known standard is the best way to resolve  
this question, but not so easy in practice.

Randy Grein, WMRRA #41

On Oct 29, 2007, at 7:02 AM, Kerry Driskell wrote:

>   I'm not saying that's her only problem, but all speedometers are  
> off. As
> far as how accurate GPS's are,I have no way of knowing for  
> sure .For the
> common street rider, it is probably the best you will find. Unless  
> you get a
> policeman to clock you. The temperature also comes into play. She  
> just needs
> to understand it is not just her problem, we all have it. Ten seems  
> to be a
> bit much though, but not unheard of.
> -----Original Message-----
> From: Randy Grein [mailto:randygrein at comcast.net]
> Sent: Monday, October 29, 2007 8:31 AM
> To: Suzuki SV650 Mailing List
> Subject: Re: : Another tech question
> Kerry, are you saying that all GPS devices have the same high
> accuracy? It should be obvious that tire size (governed by all things
> you mentioned) has a direct effect on speedo reading, but we're
> talking about a 20% change in reading with no (as far as we know)
> changes in the front. Seems like there's more to the story, but
> nothing else comes to mind.

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