Mead2007

I too recently bought this new, but I' m so new to these gadgets, so I need some help.... anyone I took it out couple of times and placed the transducer on the back hull of the boat as suggested, 20" away from the motor, It reads the bottom, Structure and all, but no signatures of any fish. So now I try adjusting the transducer with the narrow point almost facing upward to the transom, but get readings of fish at 80' to 90' and the depth is at 200'..... So i decide to go back and adjust the transducer as it says in the manual, structure and bottom contours come up fine but still no Fish, and yet I'm catching them one after another below the boat. PLEAAAAAAAAAAAASE HEEEEEEEEEEELLLLLLP !!!!!!!!