Thread: High Rock 12-26

The underwater coverage area is usually represented as a cone of coverage. It is more accurate to say the side imaging is thin and angled based on the auto range of the beam. I leave mine in auto range mode and usually get about 100 feet left or right in 30 feet of water. I have a Helix 10. It looks better the bigger you go but I'm constantly zooming to take a closer look. If you move your cursor and zoom, you can see the separation and if they are suspended close to bottom. Sometimes you can make out the shape from a shadow cast on the hard bottom return. Here is a good explanation.

https://www.humminbird.com/learn/imaging/side-imaging

Just to be clear, the black area return below the boat is not a detailed scan right below the boat from the side imaging. You're getting a limited return from the side imaging signal frequency. You'll get much more detail and deeper picture from Down Imaging and 2D. I usually troll with all three on display. Top side, left bottom 2D and DI right bottom.