Help needed for my aluminum dream.

[BADFISH]

can you use a whistle instead of a horn? Or do i have to have one of those little air horns on the boat? i didnt think if your vessel was under 21 feet you had to have a throwable, i will research it a bit more. thanks for the heads up. i was told mine was too old to fall into the requirements for a cap plate. i have one, you cant read it though its corroded.
[signature]