SDE-28S+ echo sounder is a kind of industrial control and digital echo sounder which is integrated with the 12.1-inch TFT-LCD screen, industrial control unit, echo sounding unit, data processor, internal memory unit and kinds of interfaces and I/O devices. The special design makes it dust-proof, waterproof, shockproof. It collects depth measurement, graphical navigation, positioning data, water depth data acquisition together. All these features make the instrument strong compatibility, stable performance and reliable accuracy.