Conditions like those of the Tokyo Bay or the Seto Inland Sea, Awhere a large number of vessels sailing in narrow channel, require maritime traffic control and aids to navigation activities to prevent sea accidents in advance. To ensure that this kind of vessel traffic is safe and efficient our maritime traffic systems play on important role. Contributing to the safety of maritime traffic routes, TOKYO KEIKI delivers, for example, VTS (Vessel Traffic Service) equipment and AIS (Automatic Identification Systems) Base station.