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Trip report for our Gannett in-a-day hike

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Trip report for our Gannett in-a-day hike

Postby Matthew Van Horn » Sun Aug 15, 2010 5:15 pm

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Postby GeoPooch Sobachka » Mon Aug 16, 2010 3:04 pm

Congratulations guys, we've been remembering you quite a few times on our family-and-pooches hike in the beautiful Winds this weekend. You didn't get a good GPS track to help with defining the actual mileage / elevation gain values for this long twisting route? Our raw Garmin 60CS odometer readings were way over 20 miles just to Dinwoody Pass, but this GPSr may be overcounting some...
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Postby Scott Wesemann » Mon Aug 16, 2010 3:07 pm

Hey Geopooch, nice to see you posting again :) I also had a Garmin and kept track of the mileage. I had about 19.25 to Bonny Pass. It seems like my readings were always a bit off from the map/markers we had going in.
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Postby GeoPooch Sobachka » Mon Aug 16, 2010 3:57 pm

The old paws aren't getting younger, we aren't climbing anything extreme these days. Jasmine turned 8 on this trip, actually set the new altitude record @ Bonney's, but the paws need a good rest now. Max is still pretty indestructible at 4 and just needs a good shampoo after wallowing in a $%^## dead fish up in the Titcombs.

GPS-wise, the old basic Garmins may be discarding any distance if your position changes less than the precision of the measurement (slow speed and/or poor satellite coverage). It's like you don't move at all then ... and the mileage comes short.

But model 60s have a different chip which is supposed to be a lot more precise, and I think that they changed the odometer algorithm. Now if you are slow (or if the reception is poor), it adds all the changes in your position, even the random errors! So the 60C may count a bit of mileage even as you take a rest.

The real number might be found by downloading the track, smoothing its random fluctuations and occasional holes, and re-measuring the smoothed track ... but I guess none of us are so serious GPS track aficionados. Just waiting for the others to do it :)
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Postby tigerlilly » Mon Aug 16, 2010 7:32 pm

my knees hurt just reading this!

good job!
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