iphone application

I'm looking to have someone build an application for the iphone. Bascially it should utilize google maps, and gps. It should so my phone's location on gps, and the nearest bus stop (I will provide the bus stops address). There are around 20 stops. However the application should utliize the iphones gps and where the nearest bus stop is, and route me to the nearest stop utilizing google maps. ## Deliverables iphone 3g google maps gps