Side Imaging has just a few settings. Contrast on Ky. Lake is 62, 800 KHZ in shallow water and I use the Brown Palette . Seat time is the short answer. I have been running 2 HDS 10's with 2 LSS-1's for a couple years and I still find something new on settings. Read the Manual and things start making since after a while. Here are 2 excellent sites to get questions answered.
The Hull Truth - Boating and Fishing Forum
Lowrance/Garmin Sonar/GPS