Also see: http://www.crappie.com/crappie/fishi...-798ci-si.html
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The si works best at 4 to 6 mph. I would put a si at the console and use the di up front. I have thee 998si at console and 788 di at bow and love the set up. good luck trying to nail it down
I find I can get great images down to 0.1mph...
These were taken at about 0.2mph...