The Yokogawa PB343 Adaptive Auto Unit serves as the central intelligent controller for the PT500A Autopilot system, distinguishing itself from standard steering units through its advanced BNAAC (Batch Noise Adaptive Autopilot Control) technology. Unlike traditional PID controllers that require manual fine-tuning for different weather conditions, the PB343 continuously analyzes the ship’s motion and “learns” its maneuvering characteristics in real-time. By distinguishing between actual heading deviations and temporary “noise” caused by waves, the unit minimizes unnecessary rudder movement, which significantly reduces mechanical wear on the steering gear and improves overall fuel economy.