In Calibration mode, you can set up the tablet to create accurate input data from any source drawing. Calibrating the tablet to a drawing can compensate for warpage or tilt when the drawing is placed on the tablet. To calibrate a drawing, you can specify an area on the drawing and confirm its location on the screen. You can specify one large area (the entire drawing), for drawings that are in perfect shape, or any number of user-specified equal areas to calibrate smaller portions of the drawing to limit the effects of warpage.