20 Most Recent Humminbird Piranhamax 220 Fishfinder - Page 3 Questions & Answers

Try a contact spray.

Normally a new clean faced 1 KW thru-hull transducer works to 3,000 feet ( 914 meters). Maybe the impedance of the transducer and electronics driving it do not match. Connecting cable too long? Poor connections. Look at plug pins to see if any are bent.

Be sure you have your unit set in "max mode" and run it on 200khz frequency see if this makes any difference. Also be sure your unit is wired directly to your battery not through a switch or fuse panel as this can rob your unit of voltage, impacting the strength of your sonar signal.

You need to set the transducer lower. When at speed, the hull of the ship raises up out of the water and hence your transducer is probably not deep enough at these times to give a proper reading.

Several things could cause this: Stratified water temperatures. if the water is undisturbed and there are layers of warm and cool water, this can cause the problem. Fresh and salt water layers can also cause this. Debris in the water. can cause it as well. layers of turbid water and clear water can be a problem. If these are not issues, then make sure all connections are tight, and that there is no bottom paint on the transducer.