Ultra Electronics Holdings plc is a defense and aerospace company engaged in the design, development and manufacture of electronic systems for the international defense and aerospace markets. It has three segments. Aircraft and Vehicle Systems includes airframe ice protection systems, aircraft system electronics, aircraft system test equipment, and armored vehicle electronic systems. Information and Power Systems includes airport information management systems, land mine countermeasure systems, combat systems, command, control and information systems, and nuclear reactor control and instrumentation. Tactical and Sonar Systems includes acoustic countermeasure systems, autonomous underwater surveillance systems and airborne targeting pods. It acquired Magneto Inductive Systems Ltd. and ProLogic, Inc. in May and June 2008, respectively. In September 2008, it acquired AudioSoft. In November 2008, the Company announced the acquisition of Weed Instrument Co., Inc.