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Re: Another GPS query

Subject: Re: Another GPS query
From: "Dan Dugan" dandugan_1999
Date: Sun Jun 8, 2008 2:52 pm ((PDT))
> It's worth noting that, when someone says that the get unreliable
> readings near cliffs etc. the actual error is probably less than 50
> metres. More than accurate enough for plotting which pond you recorded
> at. Where I had problems with that was when trying to find a small
> film canister cache hidden under a rock ledge 10 metres down an abseil
> in our Morialta National Park. where I needed to go voer the cliff
> within a couple of feet laterally of the correct location. BUT...as I
> said, for plotting where you are in relation to a recording, I think
> as long as you are getting a sat fix, then the error will be
> acceptable.

Well, in the case I described on the Upper Yosemite Falls Trail, track
points went scattering out across the valley at least a quarter of a
mile. I'm not sure (I edited the track subsequently in software), but
they may have been correct in one dimension and not in another, i.e.
as I moved along the trail the points followed my progress parallel to
the trail but jumped around perpendicularly.

-Dan Dugan



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