Re: SiRFstarIII testing results?

there is no doubt, that the sirf IIIs are better than what used to be. In an
exhbition inside a concrete buildning, i turned on an Etrex VistaCx and a 60
Cx with Sirf III.

The Vista didn't find any satelites and the 60Cx found 4-5 and locked on
them.

Poul B-H

"Tom H." <tom_reader@xxxxxxxxxx*.net> wrote in message
news:xiwei.200562$p47.46083@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I tried Google, but did not find what I want, so that is why I asked here.

Yes, I am interested in *very heavy* tree cover --- redwood forests that
are
pretty dark at ground level on a sunny day. Not only are there leaves and
branches interfering with signals, but large trunks as well. In open
conditions my Garmin Geko will operate just fine in my shirt pocket, I
have
not tried a pants pocket yet, but that might be interesting to try as a
comparison test. Since I already have 4 gps receivers, it will take a
very
marked improvement for me to want to buy another unit. I have two main
environment where I generally operate my gps and they are at opposite ends
of the spectrum for open skies; deserts vs. redwood forests. Most of my
travels are in the desert where reception is generally excellent except in
slot canyons, and last year I added redwood forests to my itinerary.

Tom
"mike" <spamme9@xxxxxxxxx> wrote in message
news:Atpei.2602$AR5.1094@xxxxxxxxxxx
Happy Trails wrote:
On Thu, 21 Jun 2007 01:50:58 GMT, "Tom H."
<tom_reader@xxxxxxxxxx*.net> wrote:

Hello,
Can someone tell me if there are direct performance comparisons of gps
receivers that use the high sensitivity SiRFstar chipsets to other
consumer grade receivers? I am mostly interested in the ability to
establish and maintain lock under heavy tree cover.

The first time I used my Garmin 76csx I walked around the block with
it in my pants pocket - facing outward of course, hahaha - and walked
under a line of fir trees with lots of low branches in the park, and
it never skipped a beat.

Usually, the advertisement gives the sensitivity.
SiRF typically claims -159
Numerix typically claims -158
ElCheapo Bluetooth sometimes claim -150. Watch out for those...and
anything without a number.

my Qstarz BT-Q818 with Numerix chip tracks all viewable satellites
indoors where my garmin gps18, StreetpilotII and magellan gps315 all saw
ZERO.

Same experience as happy. I put the gps in my pocket on the motorcycle.
Lost lock once on narrow street with TALL trees on either side.

Depending on your definition of "heavy"...probably ain't gonna work well
in a rain forrest.

Go visit google. Sometimes there's useful info there.

--
Return address is VALID!
Bunch-O-Stuff Forsale Here:
http://mike.liveline.de/sale.html




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