Prediction of warship motion and loads in waves is important in ship design and in warship operation. The simulation of damaged warship motion in irregular waves helps estimate the warship's chances of survival in different damage scenarios. Simulation of warship motion in waves is based on a numerical solution of non-linear equations of motion. The hydrodynamic forces and moments defining the equations are determined in each time step. The accuracy of the simulation depends on the accuracy of calculation of the hydrodynamic wave forces and moments. The simulation of warship motion in irregular waves is normally used to analyse the warship motion in specific sea or warship states. A warship in damaged condition is such a specific warship state. In this case additional forces - generated by moving water in damaged compartments must be taken into account. The paper presents the theoretical background of PRS developed simulation software, based on the conducted studies, and the program itself which can support master's or commander's decision making process in emergencies on naval vessels and craft. The tool can be applied both in training and in vessel operation.
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