I have a similar set-up to nu bu's... but with hood-pins on the stereo compartments instead of a shock sensor, and the proximity sensor is on a switch so it can be turned on and off. My boat spends a lot of time on a boat lift, on the trailer, and floating for occasional over-nights, so I had to figure out how to make it work for all situations... works pretty well as long as you're using the boat frequently (I did kill the batteries a couple times this summer). The only disappointment I have is that the proximity sensor won't work on a boat lift... no matter how much you de-sensitize it. The water moving below sets it off.
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