PSI-1 Performance Sonar Interface for LiveSight™Features:Track lure and fish movements in real time with a wider coverage area and at greater distances; targets stay in the LiveSight™ Sonar coverage area longerCombine the advantages of CHIRP Sonar (to view enhanced fish targets) with LiveSight™ sonar (to track lure and fish movements)LiveSight™ sonar coverage features a greater range: track shallow-diving crankbaits as far as 60 feet away and Alabama Rigs as far as 80 feet away HDS Carbon and NSS evo3 require a Performance Sonar Interface (PSI-1) module to work with the LiveSight transducer