I just monitor my guages and listen to the engine. I have heard alarms going off on other boats that are just sitting in the slip. I was staying overnight a year or so ago at South Beach in SF Bay and this large brandnew ugly power boat thing had this high shrill alarm that was on all day and night. There were various mechanics crawling all over it to find out why but it still took til the next morning for the incessant noise to be shut down.
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