Thanks, no more blind searching.
I am making mobile game so accuracy is not that important user cannot see much on small screen.
I use that NASA software.
I did some experiments with location in unreal, and its fine up to full length integer for location, not sure how physics behaves there, but everything else (that i tested) works fine. Full length int is cube size of 10kx10kx10k of editor grids. I hope everything works fine in that area.