Quote Originally Posted by colayn View Post
Thanks guys for the explanation. The DI is the most confusing for me, never have seen one in use on the water.
How is the shadow generated by sonar ? Is it something the computer puts there simulating a light condition ?
Again I appriciate the help, big believer in my sonar, but still living in the 2D black and white world.

Good fishing to you,
The shadow is real. Just like a shadow is generated by an object blocking light, on the sonar the object reflects some of the sound making a lower reflection from the objects behind it.