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GPSMAP 4000 Series Owner’s Manual 49
marIne netWork: uSInG Sonar
usInG
sonar
usInG sonar
When connected to an optional sounder module such as the GSD 22 and a transducer, your unit
becomes a powerful shnder. The sounder module connects through the Garmin Marine Network
and shares sonar data with every chartplotter connected to the network.
With the GPSMAP 4000 series unit, you can view sonar in different ways, depending on the type of
transducer you are using. Press Sonar from the Home screen to view the available choices:
Understanding the Full Screen
Use the Full Screen to view a full-screen graph of the transducer’s sonar readings. The range scale
along the right side of the screen shows the depth of detected objects as the screen scrolls from the
right to the left.
On the Home screen, select Sonar > Full Screen.
Sonar Full Screen
Suspended
target
Bottom
Depth, temp, and
water speed
GPS speed and
GPS heading
Transducer
frequency
Range
Understanding the Split Zoom Screen
Use the Split Zoom screen to view the full sonar data from the graph and a zoomed in portion on the
same screen.
From the Home screen, select Sonar > Split Zoom.
Sonar Split Zoom
Depth, temperature,
and water speed
GPS speed and
GPS heading
Transducer
frequency
Zoom level
Range
Zoom
window
Zoomed depth
scale