ICOM CTM500 11 External VHF InterfaceIf you are the skipper of a large yacht, you are keenly aware of the need to have immediate communication capability with all crew and passengers at all times. The quickest, easiest way to make announcements to all onboard, particularly in the event of an emergency, is with a hailer, which is usually nothing more than a large, conical speaker mounted on the mast or other elevated surface. Until recently, hailers have been connected to an intercom