Minnkota Maximizer on trolling motor causing interference.
I have a Hummingbird 570 DI . Each time I touched the pedal on trolling motor it messed up the depth reading on the 570 DI. Well I had to replace transducer because of damaged wire. When running the wires under boat deck I made sure power and transducer wires did not touch. I bought some good electrical tape and some flex tubing to protect the transducer wire. I no longer have the interference. On initial install I thought I tried everything even running a power cord to a separate battery from my trolling batteries.
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