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83/200 is the normal sonar screenshots you see. With the arches and colors. or black and white. A 455/800 transducer will show you more of a picture of what is going on below you.
This is a shot of both. Regular sonar on the right, DSI or the 455/800 picture on the left.
For saltwater you are better off not getting the DSI because its depth penetration isnt great. HDI units can do both DSI and regular. HDI units are good for saltwater, but I upgraded to HDS recently and it's much better.
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