haha
& thanx very much hugh
for this substantial corroboration of my overall
impression of gps tech
& i assume you are talking about most commercial
civilian gpsr models
since we know the top of the line will be much finer
albeit costlier etc
so russ either has some kind of a kickass receiver to
be accurate within so little as 3 feet
or he is mistaken about its ability
but since he says he uses it for piloting yachts via
waypoints that have been determined from sheet maps
i think i might want to just call him but not bump him
on this
& that way maybe get to see so rare & precious an
instrument at play
& yikes what if i could induce him
or just borrow it
to help me find the several other tough nut classmates
of his own sunken treasure rock
then i might really have a very earnest shot at
bagging all 44 class a
btw
earlier episodes did indeed at least mention a sunlit
glimpse at the pond bed in time of extreme low water
& did at least entertain snorkeling if not scuba
tho negotiating the muck in the bed is the greater
challenge than the water column itself
& the distance has proved to be farther out from shore
than was previously thought or even previously
discernible without flotation
tho i realize i cant expect everyone to have caught
every detail of every episode
& am in fact very gratified that you have caught any
of any of it
but didnt we have clinton & the 20th century to thank
for the demise of selective availability
--- Hugh Wallis <
hugh@...> wrote:
> Even with precise coordinates and a WAAS enabled
> GPSr you will not get
> closer than about 10m accuracy. Just try standing in
> one spot with the GPSr
> and watch it wander around over a short period of
> time to see what I mean.
> Waypoint averaging might help but you still have to
> get down underwater for
> the class a find by the sound of it. That's what
> makes the last 30m of
> geocaching hunts so much fun!! It's a lot better
> than the pre 2002 situation
> when there were deliberate inaccuracies introduced
> to the GPS system "for
> security reasons".
>
> It's a lot better to get a HUGE pump and suck all
> the water out of the pond
> - or maybe take scuba diving lessons :) :) Do you
> have any friends at the
> local fire department?
>
> Maybe waiting for dry weather and a clear day so you
> can get a look through
> the water will have to suffice.
>
> Good luck with the continued hunt
>
>
> _____
>
> From: BoundaryPoint@yahoogroups.com
> [mailto:BoundaryPoint@yahoogroups.com]
> On Behalf Of aletheia kallos
> Sent: Friday, October 21, 2005 1:14 PM
> To: boundaryPoint@yahoogroups.com
> Subject: [BoundaryPoint] hapiri geocoords but why
>
>
> owing to a crush of other events this morning
> i scarcely resumed the hapiri try again before noon
> when i finally succeeded in extracting from the usgs
> topo the following utm zone 18 geocoordinate data
> by careful measurement & eyeballing & computation
> easting 636632m
> northing 4697380m
> but this is probably only to about the nearest
> couple
> of meters of truth as i understand it
>
> add to that the 3 foot range russ claims for his gps
> receiver
> & we have already reopened practically the same 10
> foot window of his recollection
> so i have to wonder if he had in mind any better
> source of data than the usgs topo
> or if anyone reading this knows of any better data
> source
> whether generally or specifically for hapiri
>
> i can tell you the national geographics electronic
> pinpointing process that the map salesman performed
> for me yesterday was around 33 meters off on the
> easting & 215 off on the northing
> tho i dont know if that was complicated by any human
> error
>
> likely the first number wasnt & the second was
> tho they both made me glad i bought the paper map
>
> but anyway
> whether anyone can help with this or not
> it is already good reason to call russ the owner
> back
> first to deliver these data & ask what better data i
> could get for him
> & possibly also
> to wonder if there even is much point in using the
> gps
> for this
> if we have him himself
>
> tho i think i would prefer to get closer to his gps
> anyway also
>
> & certainly to invite his continued involvement &
> company & blessings
>
> & i think i will suggest we try again during the
> next
> dry spell
> meaning probably late summer again
> but mainly i will be calling him just to get or keep
> it cooking
>
>
>
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