A system and method for controlling an autonomously navigated vehicle uses a vehicle manager to control vehicle subsystems and to respond to commands from either a vehicle navigation system or a remote control panel. The vehicle manager controls vehicle subsystems including a speed control subsystem, a steering control subsystem, an auxiliary control subsystem, and a monitor subsystem. The speed control subsystem controls the speed of the vehicle in response to a speed command from the vehicle manager. The steering control subsystem controls the steering angle of the vehicle in response to a steering command from the vehicle manager. The auxiliary control subsystem controls auxiliary functions of the vehicle in response to an auxiliary command from the vehicle manager. The monitor subsystem monitors the status of each of the other subsystems and provides the status to the vehicle manager.