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This study involved refining a vehicle for computer guidance and GPS position control. The vehicle was powered by a small diesel engine coupled to a hydrostatic drive transmission adaptable to computer control. By interfacing GPS and a computer with the control portions of the vehicle, it was controlled automatically with no driver interference. The computer interface for the vehicle was built to use TTL level inputs and outputs on a standard parallel port configuration. All control aspects of the vehicle were dictated by two parallel ports with vehicle position and heading read simultaneously through two nine pin-serial connectors. This interface configuration was flexible so the vehicle’s software control could be executed by a variety of computers, not just one built specifically for the application. A hydraulic power steering valve driven by a single bidirectional DC motor controlled the electro-hydrostatic steering system.