Since 95% of my crappie fishing is trolling, I look for schools of crappie that give the appearance of a Christmas tree viewed from the side on my 2D unit. The school will be wide at the bottom and gradually get narrower as it gets toward the surface. Those are usually active fish that are away from cover. I had marked such a school with a marker buoy before dark very close to the area in the pic. I went to the nearest structure where I had a waypoint, which happened to be 10 yards or so away from the buoy. The fish didn't show up for the lights like I thought they would. Fishing away from normal structure (bridge pilings, docks) at night is not in my wheelhouse but I'm trying to learn.

I did have something interesting happen right after the light in prop fiasco-- I had the Lowrance X-26 on 2D and my HB 998 on down image at the same time, side by side. On the 2D it looked like a huge baitball. On the 998 it looked like the fish symbols that used to be on the cheaper 2D units. There were probably 20 somethings marked as individual fish that swam thru the screen shot. At the time I just dismissed them as Asian carp. Later on I had some gar swim thru on the opposite side of the boat from where the lights were hanging. Whatever they were, they didn't bite and didn't hang around to see what else I could tear up.