For purse seiner trawler, as for container ship, the conditions chosen provide for marginal stability. Here, the vessel capsizes in all numerical simulations in contrast to experimental results [5], [6]. Both numerical model show identical characteristics and end in capsize around the same time (Figures 8-10). As wave steepness becomes smaller, the difference between two numerical model again decreases. 4DOF numerical model with static equilibrium in heave and pitch yet again slightly overestimates the amplitude of the roll motion and 6 DOF numerical model also displays slightly larger yaw deviations and stiff rudder turnings. The difference between two numerical models in terms of maximum roll angle and with respect to wave steepness is also shown in Fig.11.