Currently there are a few sound handling projects on various model boating boards. Most are using something like an Arduino to do the controlling and playback. Somewhat above and beyond my interests, but a few years ago my club was showing at the Haydock Park event and the next stand was a 1:72 HMS Warspite with a pretty full set of sound effects. And they were LOUD. But it was a huge and heavy model, well able to carry all that was needed.
Points to bear in mind are that boat sounds will be at a greater distance, and more distant sounds need more speaker (and amplifier). Either larger diameter, or more travel, which means a bigger, and heavier, magnet. This speaker size and weight can limit your choices on a performance boat. Boats is the modeling discipline where not only does it have to look right, it has to be the correct weight as well. And distributed correctly.