Both ADS-B and IFF are acknowledge as secondary surveillance systems.However,they are still considered important inputs into the compilation of the Tactical Picture and the overall Situational Appraisal undertaken by the Ship’s command team.When the CMS only has IFF or ADS-B local tracks for a given larget then this will result in a system track being formed based upon these local tracks.Should these local tracks be correlated by the MST then a single system track will be formed.