Good post CP. I just got a HB 797 and that was taking up all my time. Hadn't thought about the pure sonar side of it. I bought one of those little portable side finding sonars to take to Canada a couple of years back. (I think HB bought them since I got mine.) Haven't used it since. I think I will put it on the boat and see what I can find in conjunction with the other side image stuff. Might have to invest in a better one like the Lowrance you have if it works.
At least when I go out and don't catch anything I can say I was too busy with the electronics to fish.
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A day late, a dollar short and two drinks behind.