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Hmm, interesting. I had not realised that Yeoman required the three points
to make a right angle on lat/lon. The only demonstration of one that I have
seen (at a boatshow), glossed over that. Other mapping software that I am
familiar with, such as OziExplorer, will georeference a linear graduated map
on any three points, with accuracy of calibration improved if the three
points are chosen somewhat as described below as necessary for the Yeoman.
Referencing a curvilinear graduated map on such software requiring 7 or more
points

Lee Martin
----- Original Message -----
From: "Jared Sherman" 
To: 
Sent: Saturday, July 13, 2002 5:56 AM
Subject: Re: latitude and longitude with Yeoman Chart Plotter


> The following is from the the YEOMAN web pages at
> http://www.weems-plath.com/Yeomanfaq1.html#how%20do%20I%20reference
>
> "First, fold your chart so your working area fits on the YEOMAN. Decide on
3 points
> of latitude and longitude in the following pattern: Two of equal Latitude
and two of
> equal Longitude to form a right angle. Points A and B should be on the
same line of
> latitude. Points B and C should be on the same line of longitude. Make
sure that they
> are not too close to the edge. The chart will not reference if they are
within an
> inch and a half from the edge of the board."
>
> Three particular points are needed to use a chart.
>
> YEOMAN can be contacted by email (see their site) if that does not resolve
the
> problem.

   

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