Occasional Autoblog contributor and Associate Editor at Engadget, Tim Stevens, is our go-to guy when it comes to navigating the intersection of technology and automobiles. So it's fitting that Stevens has published a comprehensive shoot-out pitting six iPhone navigation systems against each other to see which app reigns supreme in the race from point A to B.

The review covers everything from Mapquest's free GPS app to the far pricier Navigon MobileNavigator, along with progs that span the price spectrum from CoPilot, TomTom and AT&T. There's a great breakdown of available features and functionality, along with initial and reoccurring costs, but in the end, only one gets the Engadget tip of the hat. Check it out.