FreeLists / arachne / [arachne] Re: Web standards {and OT GPS}

["Greg Mayman" <gmone@xxxxxxxxxx>]

Arachne at FreeLists---The Arachne Fan Club!

On Thu, 2 Dec 2004 00:27:13 -0500 (EST), Steve <steve@xxxxxxxxxxxxxxx> wrote:

> Probably.  The GPS (Garmin etrex) claims that under ideal
> conditions, it can attain 1 m accuracy, and velocity
> accuracy to within .1 knot.

That's incredible!

  (Elevation/altitude accuracy is
> another thing all together... We're at ~6248 ft. according
> to the USGS topo maps, but 6180 ft. according to the GPS,
> and I note the spec sheet doesn't even mention elevation
> accuracy.)

Was that at high or low tide?

The problem with altitude is that it is expressed relative to some
hyperthetical "sea level". But since the earth is an oblate spheroid,
not a true sphere, the calculations for the height of "sea level" would
be extramely complex.

> The above quoted "waypoint" was taken just outside the
> roastery under open sky.  I don't recall that I looked to
> see what the accuracy was at the moment I marked it, but it
> was certainly better out there than it is in here.  Just
> now, sitting at the computer desk, the accuracy is remaining
> fairly constant betwen 14 ft. (>4 m) and 17 ft. (<6m).

Do you get land slips in your part of the world? Maybe the desk is
moving....

> Why own a GPS?
> Geocaching.com
>  Fun, and exercise.

Why not own one? Only because I don't have enough spare money...


.   ,-./\      from Greg Mayman, in Adelaide, South Australia
.  /     \     "Queen City of The South"    34:55 S  138:36 E
.  \_,-*_/
.       v     homepage http://users.tpg.com.au/gmone/index.htm



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