[RE-wrenches] GPS units

[Jason Lombard]

William,

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.

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.

Good luck,

On Tue, Jan 27, 2009 at 2:34 PM, William Miller <wrmiller at charter.net>wrote:

> Does anyone have a foolproof tool to measure elevation?  I have researched
> GPS units recently.  They are notoriously inaccurate for elevation:
>
> http://wiki.motionbased.com/mb/GPS_Unit_Elevation
>
> Here are few more links with GPS fundamentals:
>
> http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html
> http://www.gpsreview.net/electronic-compass/
>
> 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.
>
>
>
> William
>
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-- 
Jason Lombard
Open Hand Solar LLC.
Certified Sustainable Building Adviser
openhandsolar at gmail.com
505 795 8646

"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."

—Thomas Edison
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