My thoughts exactly, how can 80% of the iPhone owners use their phone for turn-by-turn navigation if there are no decent applications for that on the iPhone in the first place? Google Maps is not a turn-by-turn navigation solution.
I can use my Symbian phone using Nokia Maps (+navigation lisence), but a small screen phone in the cup holder of my car, running off it's own limited battery is no match for a dedicated navigation system :) I'd rather use my â 200 TomTom for that.. you can get them for even less than that nowadays.