You know, Rickie .... all this thread & the discussion about what the 2d image might be has done, is to convince me that my depth finder is better off without 2d sonar

When I look at the split screen picture that you posted from T Mike ... my attention is more on the DI image, where the "bubbles" & "chaos" are absent, and potential "fish" are present.

Fished with a buddy, this past weekend, that has a 1198 ... and now I understand what all the hubbub was about, concerning the DI from SI image discussions. I had the whole screen on DI, and still couldn't determine much about what was in the water column ... but, did find the SI portion of that image to be interesting.
I do remember seeing these angled lines on the 2d screen section, and there were "bubbles" rising in the areas we fished .... so I concede that point. There were also many schools of Shad, some deep & some at the surface, so I originally thought those angled streaks to be the Shad schools coming up or going down. I'll know better, next time I fish with him !!

Thanks all, for the lesson in sonar image interpretation. It's been a fascinating & humbling experience.