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 are equiped with GPS and system must show driver's realtime 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. 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 server and the server should show current location of the cab on the map. this can be done with integrating with google maps. THE BEST WAY WOULD BE TO INTEGRATE with Open source openGTS system,please check openGTS website. Order sending. When an order is posted, it should enter to the list of history what also should be on the same page and have status pending, when driver accepts order, the order status should be updated and show which cab number accepted the order. also should be an option to cancel the order any time. as example, after posting an order, order enters in the history list and have status pending, when one of taxi cabs accept it, status change to processing and user ID who was granted. vehicle tracking as mentioned above each taxi cab should send GPS coordinates in specified time period to the server and it should be saved in a database, dispatch service user must have an access to the the coordinates history for tracking purpose. for example should have a list of taxiID usernames and when click on the username it should show all coordinates what was reported from the taxi. as well should create database by date, and urder each date coordinates. when on the coordinates list should be an external links to google maps so it can show the all coordinates on the google map. TO MAKE THIS PART BETTER TO INTEGRATE OPENGTS SYSTEM. ADMINISTRATION PANEL should be also an administration panel to create a dispatch service user and also to give a permission to dispatch center user to create restricted number of taxi cab users. the master administrator should be able to restrict the number of taxi users for each dispatch service. for instance, if a master system administrator wants to give maximum of 7 taxi cabs users per one dispatch center that means a dispatch center can't create more than 7 taxi users