Go to Youtube and type in Humminbird Advanced Sonar. There are 7 parts that give the best instructions, explanations, and tips I have ever found.
Ditto that.......I think the guy who puts them on is named Doug. I learned so much from watching these, and am getting so much more use out of our units this year as compared to last year, when I really didn't know what the he!! I was looking at. That being said, I can tell that I still have a lot to learn......I hear people say that they can use their DI's and SI's to see fish and differentiate the fish from the strucutre, but I am just not there yet. I also still struggle to see real real clear images of brush and trees in both the SI and DI......it all has to do with the settings and sensitivity, and I know that I need more time on the water playing with it to totally figure it out. Gives me more reasons to keep going out! But I do agree, watch the 7 part series mentioned in the quote and you will learn alot.
We do not want the gift of a fish; neither do we expect a lesson on fishing; what we direly need is a chance to fish