The SOUTH SDE-19D is a professional dual-frequency echo sounder designed for accurate depth measurement and seabed analysis in hydrographic surveying. Built for reliability and flexibility, it delivers high-quality bathymetric data for rivers, lakes, reservoirs, and coastal waters.
The SDE-19D operates with dual frequencies (typically 200 kHz / 20 kHz), allowing surveyors to combine precise shallow-water measurement with deeper signal penetration. This enables not only accurate depth readings but also improved detection of soft sediments and bottom layers.
Its robust, field-ready design ensures dependable performance in demanding environments, while integrated communication interfaces (RS232, RS485, LAN, and Wi-Fi) allow seamless connection with GNSS systems, data loggers, and USV platforms such as the SOUTH Aqua M20 and Aqua M20 Pro.
Designed for professional applications, the SDE-19D is ideal for bathymetric mapping, dredging control, sediment analysis, and environmental surveys where both depth accuracy and bottom information are essential.
Why It Matters: Dual-frequency technology provides more than depth — it offers insight into the structure of the seabed. The SOUTH SDE-19D enables professionals to perform more detailed and reliable hydrographic surveys. At GeoExpert, we integrate sensors like the SDE-19D with USV platforms to deliver complete, high-performance hydrographic solutions.