Re: Stop the horns? Yikes!
We have commuter ferries that go back and forth between downtown and the North Shore every 15min in peak times, and they have always sounded their horns upon departure. It just makes sense! They are hidden away inside a terminal where you can't see them, and when they leave they go pretty fast! If you are not familiar with the waterfront they can take you by surprise very easily. I monitor harbor traffic when I am in that area and I don't think I have ever heard their departures announced over vhf.
1979 Santana 30 Tall Rig