The Tour Series Sonar Adapters are designed to provide clean, clear signals for the leading brands of sonar. For the Following Models:Garmin: Fishfinder 80*, Fishfinder 90, Fishfinder 100/BLUE, Fishfinder 120*, Fishfinder 140, Fishfinder 160/C, Fishfinder 240, Fishfinder 250/C, Fishfinder 320C, Fishfinder 340C, Fishfinder 400C, GPSMAP 135, GPSMAP 168, GPSMAP 178/C, GPSMAP 185, GPSMAP 188/C, GPSMAP 198C, GPSMAP 235, GPSMAP 238, GPSMAP 298, GPSMAP 398, GPSMAP 498, GPSMAP 440/440S, GPSMAP 540/540S, GPSMAP 545/545S, GSD20, GSD21, GSD22*With optional GARMIN part number 010-10145-00, sold separately