Modelling of decision making processes taking place in the mind of a navigator steering a ship in a restricted area is a specific problem dealt with by marine traffic engineering. Models of navigators behaviour are used for designing autonomous systems of ship movement control and simulation research on ship movement. This article presents the problem of planning a trajectory of a ship sailing in a restricted area formulated as an optimization problem – multi-stage control in a fuzzy environment. Its goals and constraints have been defined by means of linguistic terms. The theory of fuzzy sets has been used for the purpose. Some navigational situations in a fairway, i.e. a restricted area, have been considered. The authors model of navigators decision making processes has been used in simulation research. Finally, the results have been analyzed and some conclusions formulated.
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