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We implemented our application on an iPhone so that we could exploit its localization framework and built-in multitouch map support. Our application communicates with a OneBus-Away back-end server over the phone’s network connection to request information about stops in a given area, information about particular routes, and, ultimately, real-time arrival information for specific stops. It’s organized primarily around a tab bar at the bottom of the screen that provides entry points for a map screen, a bookmark screen, a recent-stops screen, and a search screen.

The map screen lets users view available transit stops overlaid on a Google Maps interface, with the ability to zoom and pan the map via multitouch interactions similar to the primary Google Maps iPhone application. The cross-hairs button automatically centers the map on the user’s location and displays nearby stops; the region-selection button automatically displays stops in the current map view, such that a user might navigate to another area of the map away from the current location and see available stops in that view. Another option would have been to automatically refresh the set of visible stops as the user navigates through the map.