Orientation sensing device

A sensing device for generating orientation data when positioned or moved relative to a surface, the surface having coded data disposed upon it, the coded data being indicative, when sensed by the sensing device, of the orientation, the sensing device including:

• a housing containing an orientation sensor and a transmitter;
• the orientation sensor configured to generate the orientation data using at least some of the coded data, the orientation data being indicative of three dimensions of a rotational orientation of the sensing device relative to the surface;
• and
• the transmitter configured to communicate the orientation data to a computer system.