Sonar 2076 is a very sophisticated submarine sonar suite capable of detecting and tracking small targets from hundreds of miles away. It has been selected for installation on the Royal Navy's nuclear attack submarine (SSN) fleet.
The United Kingdom's Royal Navy was retrofitting Sonar 2076 to the Trafalgar-class nuclear-powered attack submarines during the early years of the 21st century. Sonar 2076 was also selected to outfit the newest Royal Navy's Astute-class nuclear attack submarines. The 'Stage 5 Inboard Replacement' (Stage 5 IR) contract is the latest in a series of developments to improve the capability, efficiency and through-life cost of the system to ensure that Sonar 2076 retains its reputation as the world's most advanced, fully integrated, passive/active search and attack sonar suite. Stage 5 IR achieves the UK Ministry of Defence's (MoD's) requirement for reduced through-life costs and the need for rapid capability insertions of new hardware, software functionality and new algorithms to meet the RN's changing mission requirements.