SIMOPT is a software product simulating ship dynamics based on Fast-Time Simulation tech-nology and was developed to support the efficiency of: - tuning processes for estimating ship-model parameters in ship handling simulators and achieve the best fit between real-ship manoeuvring characteristics and the simu-lation ship models used in SAMMON - estimation and optimisation of manoeuvring parameter for specific manoeuvres e.g. emergency turns, Zig-Zag Tests or series for wind impact based on several parame-ters.