NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Andrew Nikitin
Date: 2012 Apr 16, 13:14 -0700
> I was talking of the stereographic projection (where one only needs
to draw circles)
It is same kind of device with almost identical purpose and use and it should look very similar. The only difference is that in the pictured device they use azimuthal equidistant projection of grid of parallels and meridians instead of traditional stereographic.
I can only guess at their reasons for doing so. One thing is that in stereographic projection distance betwen parallels grows as we get further from the center. For example distance between 80 and 90 is about twice the distance between 0 and 10. Azimuthal equidistant avoids this feature (that's what "equidistant" in the name means).
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