Willard again today 5/23/23

[dubob]

The top 3 marks are of the fish and their shadows, the 4th with the arrows is pointing out where the fish are when you see them on your regular fish finder imagine that is a very small part of what you are seeing below your boat. These are the fish that you have the best chance of catching while bottom bouncing.

Curt, I corrected what I believe is the 4th fish on both screen displays.  What you circled on the far left is on the very bottom and you then circled the surface line on your down scan.  My interpretation is in red.  The fish is shown on the very bottom on both screens and the position behind the boat is about right for both images.



Also, there are a couple of good videos on side & down imaging on YouTube. These videos are short (2 1/2 min max).

What is Side Imaging and How to Read It | Humminbird - YouTube

What is Down Imaging and How to Read It | Humminbird - YouTube

If your sonar has a frequency selection feature, you will want to use the higher or highest frequency for better resolution, especially on shallower lakes like Willard.  We have very few lakes in Utah that would benefit from a 400-foot range - IMHO.

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. . . the black area of the screen is not under your boat, it is the smallest part of the side scan, in the very center.

I have to disagree with you on this Curt.  The black part of the side imaging is exactly the water column directly under the boat; in your pics it appears that it is somewhere close to 20 FOW and your side areas showed a left and right range of 45 feet.  If a fish shows up in the black on the display with no shadow, then that fish is directly straight down from your transducer.  If the fish is in the black and you can see a shadow mark for that fish then it is off to on side or the other of the transducer.  The further away the shadow is from the fish is telling you the fish is further off the bottom or further off to the side of the transducer, or a combination of both.