N-body Coast Guide?

[EstrelaGaliza]

You could add a small guide to how n-body coast works?

I have done some missions using standard coast at ksptot, but I have no idea how the n-body coast works, and when I replace the standard ones with the n-body I'm not able to make mission plans and everything goes crazy.

Could you at least give me a little explanation? As I said, I handle well with KSPTOT and I've read the tutorials. It would be great to be able to make my mission plans with Principia.

Thanks