I run my Chart speed on 2D fast. Looking at the picture if the boat is moving I would say the solid line is your bait and the return on the right of the screen looks like a catfish. If you are sitting still the solid lines could just be fish hanging out under your transducer. I know you did not ask this but I will say get a color unit ASAP. You can find some for really cheap now, it will make your fishing life much easier. I'm always amazed when I see guys who fish often running black and white units.
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