What navigation apps are others using and liking (preferably in the US)? I've used Nokia Drive and like having an offline mode but testing it for my daily commute and short trips within the city I find it giving me directions to dead ends so I don't feel confident using it if I'm traveling out of the city. There doesn't seem be that many quality navigation apps right now in the marketplace. Has anyone used the apps by Navigon, Garmin, Turn by Turn, etc. and have experiences to share? I was still using my iPhone 4 for navigation with great free/cheap nav apps like Waze and Skobbler until I recently sold it.