where m is the boat mass, X¨ G is the linear acceleration of the center of mass, F is the force acting on the boat, Ω˙ and Ω are the angular acceleration and velocity, respectively, MG is the moment with respect to G acting on the boat, ¯¯I is the tensor of inertia of the boat about the body-fixed reference system axes, and T is the transformation matrix between the body-fixed and the inertial reference system (see [2] for details).