I have just recently bought a Boatswain Whistle. I got if for just under $7 on the cheaper than dirt website. (actually bought 2) I was intrigued by the whistle and have learned a little of its history. I am curious to know if anyone has a web site that shows the different types of commands or tones used with this whistle. The one i have is of German make (or so it says on the site) silver i color and in very good shape. It produces a very loud and shrill sound when blown through hard. Reportedly it is supposed to be heard over a mile away.