quote:

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>I was just wondering if any one knew how to calculate the accuracy of the
>speed measurements given by my GPS (Legend). My reasoning is as follows (can
>anyone point out a flaw)
>Assuming the time measurement is accurate (clocks in GPS do have to be
>pretty accurate, and the errors on successive points cancel each other out,
>then the speed measurement should be good to at least within the error in
>distance/second? (i.e 3m accuracy means a minimum speed accuracy of 3m/s) ?.
>This also isn't taking in to account that any systematic error in position
>can be subtrated from the calculation, given that they will be the same (or
>very close to the same) in successive readings.Also isn't the sample rate
>about 2Hz, so could we reasonably double the accuracy measurment (error in
>position/2/second?). What do you think?
>
>Dale
>

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> On Tue, 23 Nov 2004 15:33:33 GMT, "Dale Atkin" <labrador1@ibycus.com>
> wrote:
>
> A lot of the folks on the BMW forum that I frequent indicate approx. 5%-%7
> error in speed
> calculations when used on their scooters, this was mostly with the 26**
> series of Garmins mounted.

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> Look in the owner's manual. U have the 76CS and in the manual, it gives
> velocity accuracy as 0.05 meters per second steady state.