Was someone close to you using a sonar near you.
My buddy bought the same Lowrance unit as me because mine worked so well. Every time he turns his on it cause interference on my unit and visa versa. This effect is amplified by proximity and also if we are fishing a sharp drop off.
I asked a Lowrance rep and he said that unfortunately it is a common complaint that is unfix able.
What is of interest is that our other buddy has a Vexilar and he can use his beside me and it only causes a brief period of interference upon initial turn on.
It makes sense that the sound wave is bouncing around down there and the transducer can not differentiate from one wave to another.
I have found that changing the ping speed and screwing with the sensitivity and noise reduction will reduce the interference.
RJ
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