Raymarine fishfinders are so accurate that they don’t just track and show you you objects near the bottom, but also anything that’s suspended between top and bottom, no matter what speed they are moving at.
Above is an excellent screen grab that I took while fishing in the clear waters of the Gulf of Mexico where we were targeting trophy barracuda. As I was reeling my lure in fast and looking at the screen I was not sure what the image was I was seeing so I took a screen grab. My instinct was to immediately go to the side of the boat and look down and lo and behold a large barracuda was swimming away. It amazes me that the Raymarine showed me the fish that followed my lure to the boat when I did not even realize it!