Endurance.Net Ridecamp Archives

HHHHHMMMMM!  So Sara Metcalf's way is better.  Measure it on a bicycle. 
 Anybody know how accurate a bicycle odometer is?


On Wednesday, May 26, 2004, at 03:40  PM, Truman Prevatt wrote:

> The spec on GPS is 10 meters ( about 30 feet) 50% CEP. I believe it 
> 50%, and I'm too lazy to drag out my spec. That means that 50% of the 
> time the true location is within 10 meters of the calculated location. 
> The military units are. This is only for point locations. The GPS 
> system does not have a spec on distance measurements. The error in 
> distance is a factor of a lot more than just the point position error. 
> It's a function of how the position estimates are used to estimate 
> distance, the samping rate, the complexity of the algorithm used, even 
> the arithematic used in the processor.
>
> So I would trust a lot of what GPS says - especially under foliage. 
> The frequency GPS uses in not foliage penetrating.
>
> But this whole discussion is pretty well down in the nits anyway. A 
> max error of 2.5 miles is 5%.  I would expect that there are very few 
> trails out there that have a true distance withing 50% of what it 
> measured to be - unless it's all driveable and the odemeter has been 
> recently calibrated.
>
> Truman
>
> Paul Latiolais wrote:
>
> > So THAT means (following David's logic) that a 50 mile ride by 
> > definition must be OVER fifty miles,...because, as a practical 
> > matter, it must be measured with a certain limit on the level of 
> > accuracy.  Hence you must always be over and round down to 50 miles, 
> > to insure that it is AT LEAST fifty miles.
> >
> > Using a standard GPS, I think the level of accuracy is usually around 
> > 24 feet.  So that would mean that a 50 mile ride would have to be 
> > measured as AT LEAST 50 miles plus 25 ft to guarantee that it was an 
> > official fifty mile ride.
> >
> > -Paul
> > On Wednesday, May 26, 2004, at 07:17  AM, <heidi@xxxxxxxxxxxxxxx> 
> > wrote:
>
>
> ============================================================
> At the end of the day maybe the definition of endurance isn't the 
> length of
> the ride but rather the spirit in which it is ridden. ~  Maryanne 
> Stroud Gabani
>
> ridecamp.net information: http://www.endurance.net/ridecamp/
>
> ============================================================

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Riding alone is when you teach a horse all the "tools" and "cues" he needs
to handle the trail, to hold a speed, deal with hills, etc. It's also where
you develop the "bond" that causes him to "defer" to you before losing his
cool.
~ Jim Holland

ridecamp.net information: http://www.endurance.net/ridecamp/

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