Owner's Manual
Page 62
Depth Temperature Speed Suspended targets Transducer frequency Full Screen Range 56 GPSMAP 400/500 Series Owner's Manual Using Sonar Using Sonar When connected to a transducer, the following chartplotters can be used as fishfinders: GPSMAP 421s GPSMAP 451s GPSMAP 521s GPSMAP 526s GPSMAP 551s GPSMAP 556s Understanding the Full Screen Select the Full Screen option to view a full-screen graph of the transducer's sonar readings. From the Home screen, select Sonar > Full Screen.
Depth Temperature Speed Suspended targets Transducer frequency Full Screen Range 56 GPSMAP 400/500 Series Owner's Manual Using Sonar Using Sonar When connected to a transducer, the following chartplotters can be used as fishfinders: GPSMAP 421s GPSMAP 451s GPSMAP 521s GPSMAP 526s GPSMAP 551s GPSMAP 556s Understanding the Full Screen Select the Full Screen option to view a full-screen graph of the transducer's sonar readings. From the Home screen, select Sonar > Full Screen.