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Todd Frye (NavList@aol.com) wrote:

> I have found an intriguing example of triangulation from a 16th century 
mathematician, Willebrord 
Snellius(http://www.sailingissues.com/navcourse4.html). I have searched other 
web sources on the web and so far, have had no success in finding a straight 
forward explanation of how this method of triangulation works. Have any of 
you actually used the "Snellius Construction" technique, and could you help 
me understand it as a practical navigation application?
>
>   
When I studied hydrography back in the eighties we did use Snellius' 
method from the roof of our survey vessel's bridge. We used chimneys and 
church towers with known coordinates and solved the resection 
mathematically. Later on I have been on projects where either station 
pointers or 'circle charts' were used to solve the position. A circle 
chart looks similar to a Decca chart, but now covered with circles that 
resemble the angles measured.

You can find two examples of station pointers on my web site at 
http://www.dehilster.info/instrumenten/stationpointer1/index.html and 
http://www.dehilster.info/instrumenten/stationpointer2/index.html

Nicol�s


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