Needs Updating
Would also be better if schedules and pricing were shown in English aswel as Chinese.
Missing the Longgang Line
You would be far better off using Google to find a map, then use the iPhone camera to shoot your monitor. Or downloading a hi-res image and synch it. (A screenshot from your iPhone will be too small). Free and more complete than this app. It will also show you the new lines opening in a few months.