Welcome to iboats. We like information. Turning a key can mean you have it in accessory mode or started the engine. Also, do you really think boaters drive around with an audible alarm all day as 'normal?"
Okay, have a sense of humor and provide more info!
Larson sent me a link to an online manual; probably not for your boat, but I found it helpful even for my '97, so I bet it's even more appropriate to your newer model.