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Sorry,
Then I confused the thing:-)
I was talking of the stereographic projection (where one only
needs
to draw circles), and a simple device consisting of two nets of circles
(one of them on transparent paper) and a pin. It gives you a solution of
navigational triangle.

But it looks very similarly to the picture I was shown,
so I confused it.

And what is this azumital equidistant projection used for?

Alex.

On Mon, 16 Apr 2012, Andrew Nikitin wrote:

>
>> From: Alexandre Eremenko
>> I was a child I made such thing myself
>> ...
>> I suspect this is what stereographic projection was invented for
>
> Not to be a nitpick, but his specific device uses
  azimuthal equidistant projection, instead of stereographic. I doubt very 
much that as a child you could draw lines sufficiently accurately without a 
computer.
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