Sometimes its good to remember the basics. Got a poor display on your fish finder?

Try checking your mounting.

• Try adjust the transducer angle. The fish finder's transducer transforms electrical signals into information the display can read as fish. 
• Transducers need to be positioned perpendicular to the water to produce the best images.
• If the transducer is mounted on the boat's transom, loosen the mounting screws with a drill and adjust the angle to perpendicular. 
• If you're using a thru-hull installation, you may need to move the transducer for a better signal. Use marine grade sealant to fill all holes from the previous mount.