Name:  Nimrod sonar.jpg
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#1 Is caused by the waves on the surface. The wind was tough.
#2 Is the thermocline. You can just see the haze of the thermocline from the bottom up a couple feet.
#3 Is the most intersting of returns. It is Carol catching a fish and dragging it up toward the surface until it get out of the sonar beam. How I know it was Carol, the return is on the right side.

I love some good sonar.