First you need to trust your Electronics... Your boat speed needs to match the Settings on the sonar. the side imaging showing streaks is a good indication it is not set correctly... Huge bait balls are also a good indication the Fish are not feeding. In cold water you have to slow down --- get on u-Tube fishing and watch lots on setups using Helix units .. some of those guys have the camera set up poorly showing the screen without you being able to see what buttons are using.. On the water SI and DI are covered very well and watch dozens by different users. Knowing how the colors and brightness helps you understand what the Sonar is putting on the screen