With the announcement of iOS version 6, Apple has dropped Google Maps and with it, previously built-in support for travel directions via public transit. With your support, the OpenTripPlanner app, an open source application developed by OpenPlans will put transit back on the iPhone. Initially, we will offer coverage for almost all transit systems in North America (see coverage details below). The app will also add new features that Google Maps didn’t have, allowing users to combine walking, bikes, bike-share and transit together, finding the fastest and most efficient trips regardless of mode of transportation.
— Transit App for iOS 6 and Beyond by OpenPlans — Kickstarter