A water sports board, such as a surf board, is described which has a rider operated center fin that is rotatably mounted on the lower side of the board which aids in steering the board. The central fin is rotatably moved by a center fin assembly that includes a driving mechanism such as a tiller or arm secured to a rotatable shaft passing through the board that is secured to the rotatable central fin. The rider uses his or her rear foot to apply a force to the tiller or arm which moves the tiller and in turn moves the center fin so as to steer the board.