The down imaging on the 899 is not really a true "down image". It is a compilation of signals from the side scan melded by a program built into it to render a reasonable facsimile of down imaging. The same is true with the 1199.
The 859 HDdi has a true dedicated down imaging crystal and gives a much better image.
I talked to my Humminbird guru last night and mentioned that aero's Lowrance down imaging was so much clearer and detailed than my HB 1199 SI HD di. That is when I learned the facts about the 899 HD SI di.
So I'm looking for the sharpest di I can get and that would be an 859 HD di.
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