Endurance.Net Ridecamp Archives

Hello Kristi,
You are right. None of the handheld GPS units are dead on all the 
time. Like Ed, I use electronic quad sheets (Topo! Software) and 
others to plot my trackpoints and check to see that those points 
follow the trails that are visible on my software. The end result is 
that my GPS mileage on trails that show up on my software is always 
within 2-5% of the mileage from the software. I do not know if it's 
in writing but I was told that RM's are allowed a 5% variation in 
mileage so that means a 50 can actually be 47.5 miles. Then assume a 
maximum of 5% GPS error means my GPS should show at least 45 miles 
for a properly setup (legal?) 50 mile trail. I would like to see the 
mileage  as close to 50 as possible and to that end I try to make my 
data as accurate as possible by checking it against existing maps and 
other GPS units and then make a map for the RM to use as a reference 
for any changes they want to do or not.
Don Huston

At 09:18 AM 3/22/2007 Thursday, you wrote:
> I train for an accurate mileage then when the ride is
> over and my GPS says 42mi I am happy to get credit
> for 50mi.
> ___________________
>
> But how do you know that your GPS is completely
> accurate and the ride mileage is wrong? The GPS units
> I've used haven't always been dead-on, due to terrain,
> trail, weather, etc.
>
> Kristi
>
>
> Life's a journey, so enjoy the ride (and try not to fall off)
>
>
>
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Don Huston at cox dot net
SanDiego, Calif 



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Ridecamp is a service of Endurance Net, http://www.endurance.net.
Information, Policy, Disclaimer: http://www.endurance.net/Ridecamp
Subscribe/Unsubscribe http://www.endurance.net/ridecamp/logon.asp

Ride Long and Ride Safe!!

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