<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi William,<div><br></div><div>My GPS unit is accurate to about 10' on the barometric side.</div><div><br></div><div>Mine is Garmin Etrex summit</div><div><br></div><div>I use it all the time for hydro and water pumping.</div><div><br></div><div>jay</div><div><br></div><div>peltz power</div><div><br></div><div><br><div><div>On Jan 27, 2009, at 1:46 PM, William Miller wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div> <font size="3">Jay:<br><br> Accurate enough to size water pumping systems. I imagine 3 meters total, or +/- 1.5 meters. I don't need absolute measurements, just relative between two points.<br><br> William<br><br> <br><br> <br> At 01:42 PM 1/27/2009, you wrote:<br> </font><blockquote type="cite" class="cite" cite=""><font size="3">Hi William,<br><br> What sort of accuracy are you needing?<br><br> jay<br><br> peltz power<br><br> <br><br> <br><br> On Jan 27, 2009, at 1:34 PM, William Miller wrote:<br><br> <blockquote type="cite" class="cite" cite="">Does anyone have a foolproof tool to measure elevation? I have <br> researched GPS units recently. They are notoriously inaccurate for <br> elevation:<br><br> <a href="http://wiki.motionbased.com/mb/GPS_Unit_Elevation" eudora="autourl">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" eudora="autourl">http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html</a><br> <a href="http://www.gpsreview.net/electronic-compass/" eudora="autourl">http://www.gpsreview.net/electronic-compass/</a><br><br> I have a Suunto Observer watch with an altimeter. I think I can get <br> relatively accurate measurements of DIFFERENCE in elevation if I <br> measure the two elevations in quick succession. I will be trying it.<br><br> <br><br> William<br><br> _______________________________________________<br> List sponsored by Home Power magazine<br><br> List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br><br> Options & settings:<br> <a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" eudora="autourl">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br> List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" eudora="autourl">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br><br> List rules & etiquette:<br> <a href="http://www.re-wrenches.org/etiquette.htm" eudora="autourl">www.re-wrenches.org/etiquette.htm</a><br><br> Check out participant bios:<br> <a href="http://www.members.re-wrenches.org/" eudora="autourl">www.members.re-wrenches.org</a><br> </blockquote><br> _______________________________________________<br> List sponsored by Home Power magazine<br><br> List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br><br> Options & settings:<br> <a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" eudora="autourl">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br> List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" eudora="autourl">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br><br> List rules & etiquette:<br> <a href="http://www.re-wrenches.org/etiquette.htm" eudora="autourl">www.re-wrenches.org/etiquette.htm</a><br><br> Check out participant bios:<br> <a href="http://www.members.re-wrenches.org/" eudora="autourl">www.members.re-wrenches.org</a><br><br> <br><br> No virus found in this incoming message.<br> Checked by AVG - <a href="http://www.avg.com/" eudora="autourl">www.avg.com</a> <br> Version: 8.0.233 / Virus Database: 270.10.14/1918 - Release Date: 01/27/09 07:26:00</font></blockquote></div> _______________________________________________<br>List sponsored by Home Power magazine<br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br><br>Options & settings:<br><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org<br><br>List rules & etiquette:<br>www.re-wrenches.org/etiquette.htm<br><br>Check out participant bios:<br>www.members.re-wrenches.org<br><br></blockquote></div><br></div></body></html>