At what distance from the center do objects become distorted?

I am planning on making a game, and I want to know the limits of the unity engine. I know that once you reach a certain point, there are not enough numbers to show the smallest floats. At what point would this occur (I'm thinking at what point does unity stop being able to show up to four decimal places)?

Ok, I did a lot of testing, apparently it's 100,000. If you go past that, it gives a warning. At that point, it can still compute to 2 decimal places, which is all I really need, I was just being picky.