The SOUTH SDE-260D is a professional dual-frequency digital echo sounder designed for accurate depth measurement and advanced seabed analysis in hydrographic surveying. Built for performance and reliability, it is ideal for use on survey vessels and USV platforms such as the SOUTH Aqua M20 and Aqua M20 Pro.
The SDE-260D operates with dual frequencies (200 kHz / 20 kHz), combining high-resolution shallow-water measurement with strong low-frequency penetration for deep water surveys. This allows accurate depth measurement while also detecting soft sediments, silt layers, and underwater conditions.
Its advanced signal processing reduces interference from muddy water, vegetation, turbulence, and vessel noise, ensuring reliable and stable depth readings even in challenging environments.
The system integrates an industrial-grade computer with a 12.1-inch display, real-time data visualization, and onboard software for data acquisition and processing. It supports NMEA communication and GNSS integration, making it suitable for complete hydrographic survey workflows.
Why It Matters: Dual-frequency echo sounders like the SDE-260D provide more than just depth — they offer insight into seabed structure and sediment layers. This makes it a powerful tool for dredging, environmental studies, and deep-water bathymetric surveys.
At GeoExpert, we integrate sensors like the SOUTH SDE-260D with USV platforms and survey systems to deliver accurate, reliable, and professional hydrographic solutions tailored to demanding projects.
Key features
- Frequencies: 200 kHz (high) / 20 kHz (low)
- Depth Range: High frequency: ~0.3 – 300 m; Low frequency: up to ~2000 m
- Accuracy: High: ±1 cm ± 0.1% depth; Low: ±10 cm ± 0.1% depth
- Beam Angle: ~7°
- Display: 12.1-inch colour LCD
- Interfaces: USB, RS232, VGA, NMEA support
- Construction: Rugged aluminium housing
- Weight: ~7.5 kg