Quote Originally Posted by jimmyfreeland View Post
Well that sounds right in theory, but is absolutely backwards in the way they were shown on the HDS. The shadows ALWAYS came first. I would say we got some fish because the shadows are coming, and then soon the shallow fish returns. I don't know why, I guess the hds shows shadows in reverse than they should be due to software or something. If I get a chance to go back and any schooling fish are still doing this I'll take a screenshot and post some day. Remember we were anchored and the fish were swimming through the sonar beam, so this may cause the returns to show up differently as it wasn't meant to be used this way really, so software may actually show returns backwards in this case. I don't know, but I can tell you that the shadows were first. No shadows appeared on the 998, just white streaks or white specs.
HDS units have a dedicated element for down imaging as well as side imaging. Wonder if there is some overlapping between the DI and SI images on the screen. Maybe there is just enough overlap to create the effect you are seeing?