You're strolling along, minding your own business, when a pregnant woman haphazardly pulls her car up on the sidewalk and scoots over to the passenger side, yelling, "You have to drive me to the hospital right now!" It happens all the time.
Good thing you have the 99¢ MotionX GPS Drive app on your phone complete with turn-by-turn directions, voice guidance and live traffic or you'd never find that hospital. Nice work, hero.
Download links: iPhone
See also: Google Maps, TomTom, CoPilot Live, Global Navigator