I was about a 1/2 mile below a dam on the Susquehanna river. Right side of the screen was facing the dam. About 100 yards to the right, the river gets shallow and impassable for a prop boat due to rocks. I think my screen shot shows that. To the left, the depth raises fast to an island about 200 feet away. What is it on the left side that looks unnatural? Sure wish I was seeing a lot of white dots!