Provide turn by turn directions on a Heads Up Display (HUD)
Next Turn revolutionizes ease of use for iPhone navigation. Instead of looking at a cluttered map with dozens of symbols, Next Turns shows you only the distance and direction of your next turn. You have to try this for yourself to see how liberating this can be versus using the complex user interface of other navigation apps on your iPhone.
Note: Continued use of GPS running in the background can dramatically decrease battery life.