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Automatic interrogation and readout of a worldwide system of over 300 meteorological/oceanographic buoys requires careful attention to system control and communication interfaces. This paper describes the design of a system in which operation is executed by a medium-size digital computer which serves to control interrogation of the buoys, format the received digital transmissions, and put them on line for transmission over cable to a separate central data-processing center for analysis. To exercise system control, a number of functions must be performed. These are interrogation of buoys, data checking, data conversion, retransmission, control, and housekeeping.