felvic wrote:
Jim_MI wrote:
It was my understanding that CHIRP units all had a "blind spot" in the upper few inches of the water column. I am very surprised that you can see the plate at all. The transducer is supposed to be mounted slightly above the plate, leaving a water gap, with no contact between them. Perhaps your transducer is loosely contacting and acoustically "rattling" the plate?
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The water gap is just for avoid sand to stay there...
The water gap is also, and primarily, there to avoid trapping air bubbles under the transducer. My guess is that's what you are seeing. Try just adjusting the transducer up a little and see if the problem goes away.