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i've been having trouble with my cheapo humminbird matrix 12 or something like that. it came with my kayak, mounted in the hull with a transducer hull mount (foam surround, gooped in ducer). finally got fed up with it this past weekend. i ripped it out of the hull. when i looked, there were about a million tiny little bubbles in the goop stuck to the ducer. probably not enough to do anything negative to obstruct the signal. however, there was one big bubble that had water in it. when the water leeches out/dries out, it's a huge gap/bubble of air. not good. i'm sure that's what's affecting the signal. right now, i have my ducer mounted outside of the yak but have yet to test it. we'll see how it goes.
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