Scout for GPS Navigation
Scout is my favorite iOS navigation app. It consistently provides the most reliable turn-by-turn directions of any similar app I've tried. For instance, when visiting friends in a newly built development outside Richmond, Va., Google Maps literally had me going in circles, but Scout led me directly to my friends’ door. Also, I love the "Share ETA" feature, which automatically sends messages to contacts, letting them know when to expect you. They can even follow your progress on a Scout map, via a Web browser or using the app. Downside: the in-app ads.