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I was planning to make a video to go through the construction of the
symmedian point (most probable point)  and a probability ellipse using
ruler and compasses. I thought I would record of a "visualizer" that
we have in lecture rooms.

To show it to good effect I thought it would be good to have a real
example of a fix from three celestial bodies with the azimuths such
that the triangle is very much NOT an equilateral triangle.

To make it simple I would prefer them to be at approximately the same
time instead of a running fix, as a running fix would have greater
uncertainty.

I am on land at the moment and it is very overcast. I thought an
option would be to do three observation of the sun with an artificial
horizon at different times. Perhaps that is a better option, but I
thought it would be neater to do it with a more realistic example.
A published example in a book on cel nav might be  a possibility, as
long as it was n't "rigged" to be close to equilateral!

Thanks in advance for any suggestions.

Bill Lionheart

   

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