I have one that has never worked. They were constantly under development, something they didn't tell you when you bought it, so you'd call with an issue and they'd want to sell you the latest revision. Ya, the good thing is that they are built from off the shelf parts, if you are handy and motivated you should be able to make and keep it working, maybe.
I was happy to take mine out, my brother also had one on his boat, also happy when he removed it.
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