GPS based android application

I want to device a solution which will be installed in a City Bus. This will be a android unit with a Display Board and Speaker. There is a central server with web services available for data exchange. We also have http api available to communicate with Display Board. We can connect the android headphone output with speaker system. What I need from you, I want to develop an android app which has Sync Feature: It can communicate with Central webservices to get all the configured route in the system. Each route has a name and list of stoppages ( GPS Location ), time of stoppage,distance form the previous point and approximate time required User Interface: to select the route on which Bus will go. The same will be shown on display board. It need to connect to display board on wifi and connect to central server on GPRS Background activity: The device need to collect GPS data every 5-10 seconds and send the same to the server by calling webservices. It should also use it to compare with route data and play the sound file associated with upcoming stop and display the information on display board by calling a URL when the distance is less than 100 meters and about next stop when it leavses the stop and display the distance to the next stop everytime its GPS information is updated The app should work on both older and newer android system also as I like to keep the cost of device lower