Quote Originally Posted by jaxsprat View Post
The water depth is represented by the space from the middle line, to where you start seeing the ground. Yes I agree so look at the first pict there is 20 feet on either side of the middle line representing the dead area that side beams cannot reach in this 23 depth pict. So how can that tree be on each side? is it 40 feet wide??? Remember the side beams cannot read anything on the bottom of that 40 foot area, unless it is sticking up into the beams path.
That's not exactly correct. The transducer reads everything from directly under the boat, to the ground, and on the ground to where you set your limit. It just flattens out the image. If you go over a school of shad, or you run your boat through an area with the big motor, and the go directly bach through it slowley, the bubble, or shad, will show up in the area that you are calling dead. there is no dead area on SI. The down imaging just shows you this area in a vertical format.

The tree is direcly in the center. If you print that out and fold it in half at the center line, and the fold the edges out where the ground starts, you'd have a true representation of what the down imaging does, and how to read side imaging pictures on a flat surface.