Insure Speaker is Attached Before Using
A loudhailer is like it's name implies, a hailer that is loud. Look around for a horn-type loudspeaker, like a megaphone, and ensure the wires are properly connected to the loudhailer. With the volume at a low setting try keying the mike to see if there is anything coming out of the speaker.The horn is probably above deck somewhere - mast? The loudhailer is best located near the helm but if it is below deck then recommend have someone on the dock to listen and tell you when it works.The loudhailer is very useful for automatic horn signals in fog in lieu of an air horn if it has automatic settings for that. It can also be used for voice but I don't know under what situation one could use it for that purpose.If it's located at the helm be sure to check the magnetic influence of the unit and the mic on the compass, both in non-use and actuated mode.