I have a firebell I fished out of a dumpster, that came from a school
. It's got a moving plunger in a solenoid that leaps out to strike the bell when 12v is applied.
It's heavy, loud, and would probably corrode into failure on a sea-going boat.
Small piezo sounders are more common and more robust, but annoying. If you're really keen to have realistic sounds in a solid-state package, there are a number of audio playback chips
that can be used to play any sound through a waterproof speaker.
Think of how good the cellphone ringtones sound these days.