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Richard M. Pisko wrote:
> But going back to your purpose-drawn circle chart from three base points:  
> if a small rectangle of the proper size and location were to be  
> electronically "cut" from this chart, then enlarged and mounted at the top  
> edge of the A2 sheet; this section could be used for quite rapid plotting  
> of the observation points at a large scale.  No need to prick through the  
> overlay, a little circle on the overlay and one or two trials on the sheet  
> below will mark the position nicely.  I think the position of the A2 sheet  
> would have to be premarked on the large circle graph before cutting out  
> that section, however.  I belive this must be similar to some of the  
> circle charts Nicol�s used for dredging operations on the Niger.
>   
The maps we were using had all information on one sheet of paper, no 
overlays. Even the base stations would not necessarily show up on those 
charts, as long as the end-user knew which colour of circles represented 
which base station. The main purpose of the chart was positioning the 
vessel with the area of interest. So we would have coloured circles with 
the intervals annotated, like Andrew's pdf file and black outline of the 
shore and other features in the working area. This method works indeed 
quite rapid as you already guessed.

Nicol�s


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