“…The unknown k was assumed to take on one of the three possible values 0, c , c with a preset constant c , representing rectilinear, left-turn, and right-turn motions, respectively, and the tracker presented therein was based on a multiple-model algorithm using these three models for k . The above nonlinear model has been proposed for ship tracking [88,89,66]. Other ship dynamic models are available (see, e.g., [91,33,92]), some of which appear simpler and more popular.…”