Improving the performance of a stability monitoring system by adding wave encounter frequency estimation

Onboard guidance systems have emerged to improve the safety of fishing vessels providing skipper with simplified stability information. In last years, authors developed a monitoring system that automatically estimates natural roll frequency vessel. Although performance was acceptable, there were some specific situations where influence external excitations reduced accuracy estimations. this work, methodology estimate wave encounter from ship motions is proposed. Then, included in system. Towing tank tests mid-sized stern trawler different conditions been used analyse improvements obtained approach.