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    Re: Measuring Height of Eye with a Manometer
    From: Richard B. Langley
    Date: 2013 Apr 11, 13:18 -0300

    At a Boy Scout Jamboree where I instructed, the scouts built a manometer with 
    garden hoses. See, for example, 
    http://www.small-farm-permaculture-and-sustainable-living.com/land_surveying_basics.html
    Much cheaper than $900. ;-)
    -- Richard Langley
    
    On 2013-04-11, at 1:11 PM, Brad Morris wrote:
    
    > After all of this enlightening conversation about using a GPS to determine 
    HoE, I thought, "Gee Whiz", there has to be a better way".
    > 
    > There IS!
    > 
    > Technidea Zip Level Pro2000 is MANOMETER. It bases its differential height 
    measurement based upon hydrostatic pressure. The base and mobile unit can be 
    up to 200 feet (60 meters) apart, and the claimed accuracy is 0.1". They 
    state that this is for +/- 20 feet (6 meters), but that the unit can be 
    leapfrogged to essentially any distance and vertical height. I assume that 
    the 'carry' or leapfrog has a 0.1"/leap accuracy, so for practical marine 
    navigation HoE, the accuracy would be less than 1" (160 feet HoE / 20 feet 
    vertical range * 0.1" accuracy = 0.8"). This would be a over a distance of 
    1600 feet (486 meters).
    > 
    > Its a single person measurement.
    > 
    > http://www.ziplevel.com/
    > 
    > Its not cheap at about US$900, but we may not need this accuracy. There may 
    be other manometers that meet our purposes that aren't this expensive.
    > 
    > I now know what my next toy will be!!!!!
    > 
    > Brad Morris
    > 
    > 
    > 
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    -----------------------------------------------------------------------------
    | Richard B. Langley                            E-mail: lang---.ca         |
    | Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/ |
    | Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142   |
    | University of New Brunswick                   Fax:      +1 506 453-4943   |
    | Fredericton, N.B., Canada  E3B 5A3                                        |
    |        Fredericton?  Where's that?  See: http://www.fredericton.ca/       |
    -----------------------------------------------------------------------------
    
    

       
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