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56 GPSMAP 400/500 Series Owner’s Manual
Using Sonar
Using Sonar
When connected to a transducer, the following chartplotters can be
used as shnders:
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.
Transducer
frequency
Temperature
Speed
Depth
Range
Suspended
targets
Full Screen