 The SLEP modernisation comprised extensive changes to the original configuration of the ships, aimed at both extending their service life as well as improving combat capabilities.The TACTICOS Combat Management System from Thales replaced the older Signaal SEWACO MA command system and the DR3000S Electronic Support Measures suite including the Therma SKWS Decoy Launching System was installed.The DA-08 search radar and the WM22 fire control radar were overhauled, and the Thales MIRADOR electro-optical sensor replaced the Signaal LIOD optronic director.