Absolute feedback control of the horizontal plasma position has been implemented on the ORMAK tokamak. Position control was accomplished by combining a pre-programmed vertical field current with a corrector current. The pre-programmed current was that predicted from optimum control theory, based on an approximate knowledge of plasma conditions. The corrector current, which usually is different for each shot, was derived from an on-line computation of the position of the outer poloidal magnetic flux surface. As a result of these controls, this surface can be held constant to within a few millimetres throughout the bulk of the discharge. In practice, the outer poloidal flux surface is deliberately shifted inward so that the centre of the magnetic field it produces is at the geometric centre of the torus.