Rick P
I scan while I fish with my trolling motor most of the time so if I see something on SI I make a sharp turn around it which leaves a circle in my boat track on my screen. I then scan inside that circle with DI and 2D and if it is something I want to mark I know I am right on top of it when I see it on 2D. You can also do it from the console as you go down a bank then go back and check out all your circles. A buoy is another good way. My birds are not linked so anytime I see a tight circle I know it is somewhere I saw something of interest whether I marked a waypoint or not even if it was a school of suspended fish or bait ball.