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A Taiwan-developed, modular system is presented enabling real-time, multilayer underwater soundscape monitoring and source localization. The instrument combines a four-element vertical line array, embedded signal processing, and dual-mode transmission through 4G and Iridium modems. The system performs <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$1-\text{Hz}$</tex> band analysis on board. The resulting spectrums are sent to users via the dual-mode transmission, while the raw data is retained locally. Two operating modes, an energy-efficient schedule and a densified schedule, enable users to adjust the observation cadence to suit specific mission requirements. A localization algorithm that combines the time-reversal method with ray-tracing modelling is being integrated into the system. The effectiveness was validated during sea trials conducted off Liuqiu Island in waters roughly 70 meters deep, where the buoy-mounted array localized <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$2-7 \text{kHz}$</tex> sources at ranges 1.6 km with horizontal errors less than 3 meters. The system's compact form permits deployment from buoys, patrol crafts, or USVs. The prototype provides vertical resolution in underwater soundscape monitoring and real-time in-situ responsiveness, establishing a solid basis for layer-resolved ecological assessments, port-area noise management, and dynamic maritime operations.