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dsafety, I have the same problem. You only have 800 ft range in ideal circumstance (perfectly clear water, etc.). So when my fish finder loses the bottom it reads like yours until it finds the bottom again.
Nice to see you out there today Bing. Like I was telling you, my 580 screen was fogging, so I sent it back and they replaced the back of the case. And it fogged right back up on the first use. Mine does some weird chit, but so far (knock on wood) it is still working. Did you buy your unit on a credit card that might have extended your warranty? I have gotten a few breaks because of that.
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