On your si & di I get best results with sensitivity form 10 to 12 moving 2 to 3 mph. Go to Your si & di enhance & play with the sharpness & contrast to see what works best with your unit I would start around 10 & go from there hope this helps.
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A few months ago some guy put a picture on here about how to set the sensitivity and the speed of your boat to get the best picture on your down imaging on a hummingbird 688 Ci hd di and I can't find it. I would like to see it again if he sees this. Are anyone knows the best way that can help me. Thanks
On your si & di I get best results with sensitivity form 10 to 12 moving 2 to 3 mph. Go to Your si & di enhance & play with the sharpness & contrast to see what works best with your unit I would start around 10 & go from there hope this helps.
fosh
Here are several videos on how to set-up your humminbird and what the different features do.
http://www.bbcboards.net/humminbird-...-resource.html