Fish finder recommendation

[Troll]

I am surprised that you have not encountered the "interference" problem before. It happened to me way back in the 80's, when that paper graph would interfere with the flasher mounted on the back of the boat. Both transducers would send the same frequency signal and both would pick up each other's "ping" so the screens were a mess. Later as dual frequency transducers came about we could run two different frequencies and have no interference.

With the power of modern sounders and them sending pings straight out to the sides of the boat (side finder) I am not surprised that a sounder with the same frequency would pick up pings from another unit of the same frequency.
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