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The 3 sonar technologies (2d/DI/SI)...are just like screwdrivers....
All 3 are "tools" used for the same basic principle....
But each tool is best suited for its own "specific task" at hand...
And none of the 3 can perform that "specific task" as well as the other tool that is best suited for that task...
I wouldn't want to be a electrician going to work with only 1 flat blade screwdriver...
Rickie