[RE-wrenches] GPS units

Dave Click daveclick at fsec.ucf.edu
Thu Jan 29 04:31:26 PST 2009


William,

Though I wouldn't call it foolproof, and I'm not sure how accurate it 
would be for your application, Google Earth has topographic data in it-- 
just hover your mouse over a point to get its elevation. Not exactly a 
substitute for a laser level, but it may be helpful.

Dave

-------- Original Message --------
Subject: Re: [RE-wrenches] GPS units
From: Starlight Solar, Yuma, AZ <larry at starlightsolar.com>
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Date: 2009/01/28 18:13

> Hi William,
> 
> In past life as an advanced flight instructor in powered parachutes and 
> I used to carry the Garmin GPS-90. It has an analog altimeter and 
> electronic compass. It also keeps a graphical log of elevations. You can 
> turn off the GPS input for these functions and just use the analog. 
> Great if the GPS satellite system goes down and you don't want to land 
> in a plowed field because you are lost!
> 
> I doubt the resolution is good enough for what you need but it may be 
> worth a look.
> 
> Kindest Regards,
> 
> Larry Crutcher
> Starlight Solar
> (928) 941-1660
> Renewable Energy Products, Service and Installation
> 
> Mailing Address (NO SHIPPING):
> Box 11114
> 11279 S. Glenwood Ave
> Yuma, AZ 85367
> 
> Shipping and retail store (NO MAIL):
> 2998 Shari Ave
> Yuma, AZ 85365
> 
> On Jan 27, 2009, at 2:34 PM, William Miller 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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