Quote Originally Posted by dwoodfin View Post
Wayne, I'm referring to a si scan in general, not just that picture. If your in 60ft of water scanning 90ft and there's a group of fish 45ft to your right on the bottom where will they show on the screen? Will they show in the "black" or will they be over on the side where the bottom is displayed? This question really has nothing to do with the fish Id feature and I may be asking in the wrong place.
Side Imaging is Slant Range sonar. It displays what is within the SI pulses within the set SI Range.
Anything somewhat below the transducer and above the bottom will be recorded in the water column (black areas). If a fish is not under the transducer but to the sides, it will be recorded the same way, but against the color background you choose. You won't know how far or how deep any of those are, they will be displayed as the distance from the transducer.
You can get somewhat of an idea how deep by any shadows on the bottom they create (sonar cannot see through them). The farther a fish is from the shadow, the higher in the water column they will be.

This may help with the shadow deal: