Defence electronics supplier Ultra Electronics has won a contract worth about $25m (£15m) to supply the US navy with sonobuoys, which detect submarines.The contracts have been awarded through ERAPSCO, a joint venture with the manufacturing group Sparton to supply sonobuoys. The sonobuoys will be delivered over a 12-month period starting in mid-2011."We have been able to secure these awards because of our focus on constant product innovation coupled with high quality manufacturing and on-time delivery," Ultra's chief operating officer Rakesh Sharma said. "The US Navy has recognised the support it receives from USSI and ERAPSCO by awarding these contracts at a time when the procurement process in the US is being slowed by external factors."RG