NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Measuring Height of Eye with a Manometer
From: Richard B. Langley
Date: 2013 Apr 11, 13:18 -0300
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 > > > > ---------------------------------------------------------------- > NavList message boards and member settings: www.fer3.com/NavList > Members may optionally receive posts by email. > To cancel email delivery, send a message to NoMail[at]fer3.com > ---------------------------------------------------------------- > > View and reply to this message: http://fer3.com/arc/m2.aspx?i=123524 > ----------------------------------------------------------------------------- | Richard B. Langley E-mail: lang@unb.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/ | -----------------------------------------------------------------------------
