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Skipped La Jolla today and went to the harbor to check out this fish finder issue.
I figured out the noise setting affects the reading. It was set to LOW and I changed it to HIGH and it started working. I tried a test without sand in the transducer plate and the reading looks clear. I intentionally stuffed sand down the scupper and in the transducer plate and the reading was very noisy. The sand does affect the reading and adds noise.
After my test, I washed the scupper with water. I probably flushed the scupper for about 20 seconds with a hose. The attached photo shows what it looks like after the wash. A shell was even lodged in between the transducer and the plate!
bolocop's cut out fix may be the best solution for sand. Thanks bolocop.
I'm returning this fish finder because it doesn't seem right.
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