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That's a good example that the Tevis trail is challenging terrain for GPS technology, especially one that is not equipped with the latest and greatest.

April
Nashville, TN

On 4/24/07, Ranelle Rubin <raneller@xxxxxxx> wrote:

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
916-848-3662 fax




>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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