Thanks Jochen.

PRN appears to be this according to Wikipedia:
pseudorandom noise (also pseudorandom binary sequence) (PN or PRN code)

As far as the Signal to Nosie ratio... The higher the number, the better the signal?

What is considered "good?" On my car, I usually get 7-8 satellites, whereas my wife's car only gets 5-6 (others are 0.0)