[RE-wrenches] GPS units

[Starlight Solar, Yuma, AZ]

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