False reading from my Raymarine

[Gotta Bite]

This weekend I noticed that I was getting a false depth reading on my screen. The other 2 rigger lines were accurate. The rigger with the Sub troll probe was showing up twice as deep and near the bottom in 110 FOW. I was thinking that maybe the other Raytheon thru hull may be interfering with it so I shut that down and the problem persisted. The transducer on the Raymarine C90W is mounted on the transom and I usually operate them on different frequencies. Does anyone know how to remedy this? Your feedback is appreciated. Thanks.

 

 

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