I can only answer from theory, but the geometric dillution of precision decreases with N, the number of independent measurements of satellite signals. In pract

I can only answer from theory, but the geometric dillution of precision decreases with N, the number of independent measurements of satellite signals. In practice, there's a floor to the noise which is a reasonable lower bound on your uncertainty. There's also factors that can't really be overcome from more sats, like multipath effects.