I bought a 20 foot sail boat to sail the apostle islands on lake superior. I would like a fog horn, but don't want to spend like 10k/have a 900 pound horn on the front of my boat. Any way to get that iconic BWOOOAAAAAAAAAHHHH Sound on the cheap?

I bought a 20 foot sail boat that I intend to sail around the apostle islands on lake superior. I want a fog horn, but they're either huge, 10k or both. Any cheap options for that iconic BWWOOOAAAAHHHHHHHHH?