One of my little indulgences on a modern trad boat with a modern diesel engine and no open engine room is my horn.
I spent some time, a few years ago, in New Orleans and was fascinated by the Mississippi steamboats with their calliopes and steam whistles.
We don't have steam onboard, so we (I actually) had the boat fitted with a Kahlenberg compressor driven Marine Air Horn which has a beautiful 322/254Hz tone. Its great on open stretches of canal when coming to blind bends, in bad visibility when foggy, etc and on the bigger rivers like the Thames. It certainly gives some the big plastic gin palaces a surprise when they start hooting from their flybridges.
I actually get a lot of pleasure from polishing it as it sits on the top of the cabin midships, so it doesn't deafen anybody standing at the cratch.
However, it can be a bit over the top in sleepy canalside villages etc (133dB at 1m) and I'm not a noise freak really.
I've seen some other narrowboaters using a hand held horn not unlike a post horn, which would seem to be more appropriate for these kind of situations.
Does anybody know who sells them ?
Best Regards
Mark