The Boat Horn iHorn is made from a 1960’s or later nautical air horn. Originally, boats did not have “horns” per se but rather fog warning devices. Originally, they were bells and gongs, then cannons. Ultimately, as technology advanced, pneumatic air horns became favored and replaced other signaling devices. The Boat Horn iHorn is a simple device, but which produces significant sound. It warns and pleases us through the production of voluminous sound at a reasonable price.