Yes, the iPhone has Google Maps on it, but Khoi Vinh feels the need to carry along a mobile version of the official New York Metropolitan Transit Authority subway map on his iPhone. His solution is what he calls “the most awesome low-tech New York City subway maps for your iPhone that you can find anywhere” — it’s simply creating map tiles and adding them to the gadget’s photo albums. I’ve heard of this on other devices. Via TUAW. Photo: Khoi Vinh.