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What you think is bamboo seems to be an optical illusion of the same prop wash you are seeing in the SI image posted just above the DI image ...
The HB SI units derive the DI image from the data received by the SI piezoes ...
And because sonar echos are plotted as "distance away from the xducer" ... The prop wash "distance away from the xducer" is painted in the SI image as "x feet left of the centerline"...whereas that same rendering into the DI image is painted as "x feet below the top of the display ...
Take the left SI pane in the SI image and rotate it 90° counterclockwise ... And you will get the DI image that looks like the bamboo DI image ...
Rickie
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