With that info, it doesn't sound like the engine alarm (which only sounds for a few things, anyways), I'd agree with Skibum that it may be the CO monitor. The only other (standard) thing it could be is the built-in depthfinder alarm. If you were running with the camper canvas up, sans the back piece, that can cause CO to be sucked into the cockpit and eventually the cabin.Went out for a sunset cruise this weekend and about an hour in I had a beeping alarm start sounding and I'm not sure what it is for. I've had a low gear lube alarm sound before and it was super loud and constant - this weekends alarm was very faint and was a beeping alarm that was coming from inside the dash/helm. I shut the engine down, ran a visual check, waited 5 minutes and when I started it back up the alarm was gone and never came back. Anyone have this happen or know what it could have been an alarm for? Thanks