Over the last year, companies specializing in navigation systems have seen their markets shrink as people start navigating from their smartphones instead. Why buy more equipment when you can achieve the same result from your sophisticated mobile? Now, google is even giving these smartphone navigation apps a run for their money by giving away their application for free; the software converts any smartphone with the android operating system into a GPS enabled device. How good is the service? Are there bugs? Is it slow or fast or usable? NYtimes gadget critic, Bob Tedeschi, gave the navigation app a nice onceover in yesterday's paper, read more here.