The invention relates to systems for steering machine tools and in particular to systems that display information to an operator of the machine tool. Such a system comprises a manually controlled cutting tool. The system receives data that defines a model of a desired cut to be made on a workpiece by the cutting tool. The system receives further data related to the current position of the cutting tool in, at least, two dimensions. A processor generates from the received data a display. The display shows the desired cut to be made and a cutting tool icon at the current position of the cutting tool relative to the desired cut. The display also shows an indication of the current error between either the current position, or direction of travel, of the cutting tool and the desired cut. An operator does not need to look at the workpiece, a drawing and the Digital Read Out simultaneously as with existing systems.