NavList:

Frank, what would the components of such a "kit" be?  That is, what would it take to convert "visual satellite navigation (VSN)" into a complete system?  I presume we are talking about some sort of software app?

Based on what you have said in this post, plus what I can remember of your previous posts, it would seem that the software would produce an array of star charts with the ISS track superimposed, which would match a variety of latitude and longitude combinations.  You would start with an assumed position, and get a number of charts that would cover locations within a certain radius of your assumed position.

If your assumed position is 100 miles in error, the now-traditional St. Hilaire method will yield a really long intercept...but it will still help establish a fix, and will provide the raw material for a much more accurate assumed position when you do your next sight.  I am guessing that with "VSN" if your initial AP was way out, you would try and dial in your position a bit more accurately on the next orbit of the ISS.

Alternatively, if you could photograph the ISS at a predetermined time, then you could search up a matching chart at your leisure.

Bob