confusion on whether bona fide turn-by-turn GPS software will ever arrive on the iPhone 3G (though signs are pointing to "yes"), but considering that it's not there now, Autoblog took Apple's new darling for a spin in the Bay and churned out some impressions. If you're looking for the long and short of it, the iPhone 3G's navigational abilities aren't that impressive. The reviewer even went so far as to say that having a passenger manning the arrow buttons that showed your next move was "almost a necessity." Additionally, the GPS flaked out and lagged behind the current location quite frequently, which can definitely be a problem when attempting to navigate one-way streets in an unkind downtown. So, should you sell off your standalone navigator on the way to pick up your new iPhone 3G? Probably not -- at least not just yet.