The invention relates to a device for determining the target point of an observation unit. The device comprises a target area; a scan line projector, which projects at least two non-parallel scan lines and moves said scan lines across the target area; a control unit, which controls the movement of the scan lines; and an optical target point detector, which provides a target point signal to the control unit if a scan line is detected. The control unit determines the position of each scan line 03 in the target area at the time of the detection by the target point detector and outputs the virtual intersection of the two scan lines at said time as the target point. The invention further relates to a method for determining the target point of an observation unit.