The hardware for the original combat system was based around the Motorola 68000 family of processors. The replacement combat system consists of the tactical and fire control components from the Raytheon CCS Mk2 system, combined with the sonar interfaces developed for the improved combat system used aboard "Sheean" and "Dechaineux". Countermeasures include a Condor CS-5600 ESM intercept and warning unit, and two SSE decoys. The boats are fitted with a Marconi SDG-1802 degaussing system, and a receive-only Link 11 combat information exchange datalink. In October 2006, Sagem Défense Sécurité was selected to fit the "Collins" class with SIGMA 40XP gyrolaser inertial navigation systems.