Compatible with Garmin Models: echo: 151dv, 201dv, 301dv, 551dv echoMAP: 50dv, 70dv CV: 20-TM (4-pin), 20-TM (8-pin), 22HW-TM, 23M-TM, 51M-TM, 52HW-TM GT: 20-TM, 20-TM, 21-TM, 22HW-TM, 23M-TM, 30-TM, 30-TM and GT15M-IH, 30-TM and GT8HW-IH, 34UHD-TM, 40-TM, 41-TM, 50M-TM, 51M-TM, 52HW-TM GCV: 10 Scanning Sonar Module GPSMAP:1020xs, 1040xs, 7407xsv, 7408xsv, 7410xsv, 7412xsv, 7416xsv, 7607xsv, 7608xsv, 7610xsv, 7612xsv, 7616xsv, 840xs GSD: 25 Premium Sonar Module