Calibrating

If you haven't looked at the Smoothboard calibration assistant you should.
The white area in the screenshot shows the calibrated area (in this case 54% )and the black area shows the wiimote's possible tracking area. This visual tool is very handy when first learning to setup the system as you can experiment with different wiimote positions until you get a reliable tracking result - it removes the guess work! In practice, we find that tracking over 30% is sufficient to give reliable results.