Taxi Dispatch System with GPS tracking functions

We are looking for a professional with experience in GPS to create internet based "taxi dispatch service". The basic idea of the project is to create an online system where taxi office will enter orders into system online and taxi drivers using their mobile computers in cars could pickup them. System explained: taxi office will pickup order by phone and enter into online system. Taxi cars are equiped with mobile computers and have a realtime updated online interface to see all new orders. Driver will be able to pickup order from his car and go to the location. As soon as driver pickups order, system should remove order or show it unavailable to the other drivers. Every driver must have his own username or identity so that Taxi Office can see who is currently serving the order. Also cars will be equipped with GPS and system must show driver's real-time coordinates on the map. Taxi driver's interface should also show orders on the map so that driver can easily find the closest order. This can be done for example by using google maps api by using address from order. Basically there should be a map and order icons according to the location. Both driver's and tax office interface can be done as a normal website. Taxi drivers are using mini pc systems with 7" screens. Programming language PHP, database MYSQL. Please feel free to ask more questions. Credit / Debit Card Authorization: Include the Credti/Debit Card authorization part of the apps. At the minimum Credit Card if not the debit card. Please advise what harware will be require for the credit/debit card authorization directly from the CAB? DETAILED PROJECT DESCRIPTION. TAXI DRIVER INTERFACE It should be a small .exe application what should exchange data with the server in real time. should be a version what in linux also in windows. When a software started up, should be a login and password field, what each time should be authorized by remote server. after when taxi user login in, the software should start. when a new job is posted from the dispatch service it should immediately appear on the driver's screen , basically driver should see customer name, address and phone number and also must have buttons "accept" or "decline". when he push accept button the software should send data the server and update dispatch center screen where the order already accepted, on the dispatch screen server it should show the taxi cab user ID near the order who was has accepted. all updated also should appear on dispatch service screen. As well when the page is updated it should be impossible for another taxi driver to take the same order, for example when 2 taxi drivers push accept button but one a second early the second driver should get a message that order already granted to other cab. The what cab who was granted the order, also should get a note on his screen that he has been granted and also should present a cancel button, this is just in case he change his mind for some reason not to complete it , so when he click it ,it will update the page and will make available for other taxi cabs to accept it. GPS and Internet connection. each computer on the taxi also will be equipped with a GPS receiver connected via USB [login to view URL] receiver doesn't require drivers, alternatively also can be connected via RS232 serial GPS receiver. Computers will be connected to the Internet via GPRS or 3G broadband modem. Same software also should receive data from gps receiver and send coordinated to the server in customizable by user time interval(for example every 1 minute,2 minutes or 5 minutes) and save coordinated on server's database. DISPATCH CENTER INTERFACE Dispatch center interface should be a web based with login and password. Should have input fields to post an order, (name, address, phone number) as well should have a map of the city and on the map should show location of the cabs. GPS receiver what's connected to the car computer should send coordinates to the serv