Endurance.Net Ridecamp Archives

April,

Another variable is that section of trail is in a canyon with quite a few 
trees. It is a wide canyon, but a deep canyon (about 3 miles top to bottom).

Ranelle Rubin
R.Rubin Consulting

raneller@xxxxxxx

916-663-4140 home office
916-718-2427 cellular
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> From: April <endurancerider@xxxxxxxxx>
> To: "Smith, Dave" <dsmith@xxxxxxxxxxxx>
> CC: ridecamp@xxxxxxxxxxxxx
> Subject: Re: [RC]   [RC] GPS
> Date: Tue, 24 Apr 2007 13:04:22 -0500
>
> Hi, Dave,
>
> It actually depends on a lot of things. The answers to the following
> questions can go a long way towards answering the original question.
>
> How good was your GPS signal? Where did you carry the GPS? You'd have to
> have a good solid lock on as many satellites as possible. I suspect the
> Tevis trail is probably one of the more challenging in respect to GPS
> technology. The Legend units do not have the high sensitivity SIRF III
> receiver that many of Garmin's later units have. So that right there can be
> a challenge to the accuracy of the unit in the Tevis environment.
>
> Was the 6.1 mileage readout come directly from the unit itself or did you
> load up the track point data onto the computer and have a program calculate
> the distance from the track points?
>
> What setting were you using for recording track point data?
>
> Was WAAS enabled or not? (not sure this would make a difference in your
> exact location, though)
>
> Are you running the latest firmware for the unit? This can be downloaded
> from Garmin's web site and sometimes can make a difference.
>
> The last question to ask is how and when did the Park Service come up with
> the 8 mile distance? Their method of measuring may have been flawed or not
> updated or based on old, unreliable maps. I'm not saying it is wrong, I'm
> just saying it could be.
>
> April
> Nashville, TN
> http://www.tracetribute.com
> http://endurancerider.blogspot.com
>
> On 4/24/07, Smith, Dave <dsmith@xxxxxxxxxxxx> wrote:
> >  Just used for the first time my new Garman "Legend" and I have a 
> > question
> > for those of you who know something about GPS.  We rode the Western States
> > Trail (Tevis) yesterday from the Hwy.49 crossing to a mile past Poverty
> > Bar.  The Trail signs said that distance was about eight miles one way.  
> > The
> > GPS, however, stated it was only 6.1 miles one way.  Why the discrepancy?
> > I can't believe the state parks/WSTF were that far off when posting their
> > signs.  So what's the explanation?  Thanx.
> --
> "It doesn't matter how slowly you go - as long as you don't stop!" -
> Confucius



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