Abstract: A horn assembly for installation within an opening in a boat structure having an exterior surface and an interior surface, is disclosed. The horn assembly includes a noise generator component whose output is directed through a trumpet member having an inlet section and an outlet section. A flared element adapted to extend through the opening in the boat structure has an inner end connected to the trumpet member and an outer end with a peripheral flange that bears against the exterior surface surrounding the opening. A grille element extends over and secures the flared element and thus the horn assembly to the boat structure leaving only the grille element visible on the boat exterior.