HITT N.V.. The principal activities of the Group are the development, design and production of air traffic control & vessel traffic management systems. In addition the Group develops and manufactures related products such as noise monitoring equipment, traffic displays and flight planning terminals. The Group also develops and produces decision support software for production processes in steelworks. The Group's activities are carried on through two segments: air and vessel traffic management & control systems and hydrographic and navigation systems. The Group operates under the names of HITT (Holland Institute of Traffic Technology) and QPS (Quality Positioning Services) in the Netherlands & USA.