To provide an underwater information recovering and relaying method by which positional information of an underwater sailing body and observed data in the underwater sailing body can be transmitted in real time.

The relative positional data of a sailing body in relation to a buoy main body 1 is formed from the three-dimensional azimuth of the sailing body found from absolute inclination information of the buoy main body 1 from a SSBL measured signal vertical reference 10 which has received signals from an underwater sailing body through a transducer 6, and the distance to the sailing body found by a slant range counter. Simultaneously, the absolute positional data of the buoy main body 1 is found from a GPS signal received from a GPS antenna part 3 by a GPS signal processing part 7, track positional information of the sailing body is found from these positional data, and the track positional information is transmitted as real-time information from a satellite communication signal processing part 8 to a land base through the antenna part 4.