A working celestial navigation simulation would be a dream come true for me. There was a sailing simulator which, for a while, claimed to be able to simulate the practice. (The name escapes me at the moment.) However, it too was found to be inaccurate and the developer discontinued working on it.
I wonder if a table of meridional parts (such as that found on
page 667 of Bowditch, explanation on page 558) could be used to overcome the "flat Earth" problem. In any case, you'd still be stuck with the inaccurate sky. But, it might mean one less problem to solve for the devs, a modder or anyone else clever enough to find a solution.
Oh, well. I suppose I'll continue to keep a lookout for a sim that includes celestial. I'll let everyone know if I find anything.