A water apparatus for USBL operation comprises: a main body; a floating unit installed on an outer side of the main body to provide buoyancy; a USBL transceiver installed on a lower portion of the main body to transceive a sound signal between an underwater moving body and the same; a control unit which is embedded in the main body, and uses the sound signal transceived between the underwater moving body and the USBL transceiver to calculate a position of the underwater moving body; a communication unit installed on the main body to transmit a result calculated by the control unit to a mother ship; a power supply unit embedded in the main body to supply power to the USBL transceiver, the control unit, and the communication unit; and a mooring unit whose both ends are connected to the main body and the mother ship to moor the main body while the main body is separated from the mother ship. A more stable and efficient operation environment than conventional USBL operation using a pole can be provided.
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