coconut telegraph
n.— «SSB networks are simply an organized meeting place on a particular radio frequency at an established time, where an unlimited number of boaters can meet and share the latest weather forecasts and local news. Nets are usually controlled by one person, who acts something like a telephone operator to direct the flow of callers. This method of sharing information is sometimes called the “coconut telegraph.”» —“Cruisers Stay in Contact on the ’Coconut Telegraph'” by Pat Rains The Log (Irvine, California) April 29, 2009. (source: Double-Tongued Dictionary)
Further reading
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