Embark NYC makes mass transit simple. It provides everything necessary to get around on the New York subway, and it even works underground!
Note: Embark NYC was originally called "Ride NYC" and may still appear as such in the App Store. The feature-sets are the same.
Key features:
Trip planning, even with no cell signal. Gives you detailed trip information
Arrivals information about upcoming trains for each station
Google street map with GPS integration for each station
Interactive multitouch subway map
Elegant and user friendly design
Geolocation for planning trips to specific addresses or landmarks
Bookmarking favorite stations
GPS integration for finding the stations closest to you
Detailed delay and planned-works information that can be pushed to your phone
Available on both iOS and Android
Check out the website at http://letsembark.com/