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In the field of ship control the proportional plus integral plus derivative (PID) controllers remain common place. However, increasingly new autopilot strategies, promising higher levels of robustness and/or adaptive qualities, are being proposed as possible successors to the PID. Fuzzy logic is a modern control technique which is currently finding an increasing and diverse range of novel applications. By means of full scale sea trials, a newly developed Fuzzy logic autopilot is evaluated and a comparison made to its conventional equivalent.