Quote Originally Posted by Jerry Blake View Post
What you describe seeing on your graph sounds very much like a thermocline. Interference from another sonar usually displays as uniform, diagonal lines on the screen and interference from your trolling motor (RF) usually displays as vertical lines going all the way from the top to the bottom of your screen.
Just got a chance to get back on the Lake after the rains and the thermocline is gone. The fish are deeper and the sonar looks just like it did in the spring. I'll know what I'm looking at next time.

Thanks for all the help.