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<div class=Section1>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>A caution to all. There are various types
of GPS units, with varying accuracies. The most accurate are spec’d at
around +/- 6 feet. I have a Garmin Etrex and under normal circumstances it
delivers at that spec or better (+/- 3 feet). Near tall buildings or in a steep
canyon, the accuracy goes to pot but for known reasons (multiple reflections of
the radio signals). I have no manufacturer’s info on elevation, but
knowing how GPS units work, the resolution/accuracy in elevation should be
roughly the same. </span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>- Peter</span></font></p>
<div>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Peter T. Parrish, President<br>
California Solar Engineering, Inc.<br>
820 Cynthia Ave., Los Angeles, CA 90065<br>
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885<br>
CA Lic. 854779, NABCEP Cert. 031806-26<br>
peter.parrish@calsolareng.com</span></font><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'> </span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Jason Lombard<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, January 27, 2009
2:02 PM<br>
<b><span style='font-weight:bold'>To:</span></b> RE-wrenches<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [RE-wrenches] GPS
units</span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>William,<br>
<br>
Topographic maps are great if your familiar with them. A laser if you can
afford it or the best I have heard of is fill a tube or pipe with water from
the pump to your tank and measure the psi at the base of it. The calculation is
2.31 feet of lift for every psi. Not everyone has their piping rolled out or on
site yet so this could be a challenge and again is very accurate.<br>
<br>
BTW - GPS units are inaccurate to the extent that they are 40 feet off
horizontally and 90 feet vertically. This means you could be up to 130 feet
off. Big difference when your sizing for particular pump out put.<br>
<br>
Good luck,</span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Tue, Jan 27, 2009 at 2:34 PM, William Miller <<a
href="mailto:wrmiller@charter.net">wrmiller@charter.net</a>> wrote:</span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Does anyone have a
foolproof tool to measure elevation? I have researched GPS units
recently. They are notoriously inaccurate for elevation:<br>
<br>
<a href="http://wiki.motionbased.com/mb/GPS_Unit_Elevation" target="_blank">http://wiki.motionbased.com/mb/GPS_Unit_Elevation</a><br>
<br>
Here are few more links with GPS fundamentals:<br>
<br>
<a href="http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html"
target="_blank">http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html</a><br>
<a href="http://www.gpsreview.net/electronic-compass/" target="_blank">http://www.gpsreview.net/electronic-compass/</a><br>
<br>
I have a Suunto Observer watch with an altimeter. I think I can get
relatively accurate measurements of DIFFERENCE in elevation if I measure the
two elevations in quick succession. I will be trying it.<br>
<br>
<br>
<br>
William<br>
<br>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<br clear=all>
<br>
-- <br>
Jason Lombard<br>
Open Hand Solar LLC.<br>
Certified Sustainable Building Adviser<br>
<a href="mailto:openhandsolar@gmail.com">openhandsolar@gmail.com</a><br>
505 795 8646<br>
<br>
"I'd put my money on solar energy… I hope we don't have to wait 'til
oil and coal run out before we tackle that."<br>
<br>
—Thomas Edison</span></font></p>
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