Compatibility | Garmin Sounders; Garmin Fishfinders:300C; 400c; Garmin GPSMAP Chartplotter:420; 420s; 421; 421s; 430; 430s; 431; 431s; 440; 440s; 441; 441s; 520; 520s; 521; 521s; 525; 525s; 526; 526s; 530; 530s; 531; 531s; 535; 535S; 536; 536s; 540; 540s; 541; 541s; 545; 545s; 546; 546s |