What sound producing device(s) is required when boating on Alabama waters in an 18 foot powerboat?

When boating on Alabama waters in an 18-foot powerboat, a sound-producing device is required. This can be a whistle, horn, or any other device that can produce an efficient sound signal. It must be audible for at least half a mile. Additionally, if the vessel is 26 feet or longer, a bell or a similar device is also required.