The modern simulation software includes an impact of forces acting on the ship hull. One of the mostsignificant forces is sea waves acting. The mathematical model allows simulation of ship motions in irregularsea wave area, both – at deep and shallow waters. The wave surface model enables simulation of the waveelevation in compliance with wave spectrum occurring in various conditions. The paper presents generaldescription of the sea wave model used in maritime simulators. An example of such simulators is used at the laboratory of the Naval University of Gdynia, where it is operated basing on NT-Pro 5000 software by Transas Marine. The latest version of simulation software gives a possibility to select the wave spectrum. Selection of the waving type, depending on sea area location, makes the ship movement more reliable. This is an important element in testing the ships behavior process