This has happened twice to me now. I take the boat for a good cruise - all's well. Then After a while of sitting, I get ready to return and I get a single beep alarm ever second (maybe more often - but its a single beep at a time. Not the normal 2 beep of IAC). I get the beep even before I start the engine. Once the engine starts, all looks fine - but still beeps. I've checked everything I can think of. Like I said, the alarm starts sounding even before I start the engine so it must be from some thing non-engine related. I'll probably get an IAC just because its such an easy fix - but does anyone have any ideas.