A method, including receiving, by a computer, a sequence of signals indicating a motion of a hand of a user within a predefined area, and segmenting the area into multiple regions. Responsively to the signals, a region is identified in which the hand is located, and a mapping ration is assigned to the motion of the hand based on a direction of the motion and the region in which the hand is located. Using the assigned mapping ratio, a cursor on a display is presented responsively to the indicated motion of the hand.