Compact echo sounder HN-400M

dual-frequencymultibeam

Overview
The CHCNAV HN-400M is a compact, dual-frequency multibeam echosounder intended for shallow-water and nearshore hydrographic surveys. It operates at 400 kHz and 550 kHz with FM CHIRP, integrates a high-precision IMU (0.03°), and provides a wide 145° swath. The unit is lightweight (3.5 kg) for rapid deployment on USVs and small vessels and requires no calibration at installation.

Main features

• Dual-frequency operation: 400 kHz and 550 kHz with FM CHIRP
• Integrated IMU with 0.03° roll and pitch accuracy
• Wide swath: 145°, up to 6× water depth
• Lightweight, compact design: 3.5 kg for USV and small-vessel deployment
• EasySail Android software for one-touch setup, parameter configuration, acquisition and real-time preview

Benefits and performance

• Flexible frequency selection: 550 kHz for high resolution in very shallow waters; 400 kHz (FM CHIRP) for improved penetration in turbid or deeper conditions
• Integrated IMU delivers real-time motion compensation (centimetre-level correction) to reduce roll, pitch and heave effects and improve line continuity (effective through Sea State 3)
• Wide swath reduces number of survey lines and total survey time (coverage up to 6× water depth)
• Compact, integrated package simplifies installation on constrained platforms and minimizes system mass for USV operations
• Field-friendly workflow via EasySail Android for rapid commissioning and live data preview

Use cases

• Channel dredging surveys
• Nearshore and coastal hydrographic mapping
• River and lake bathymetry
• Port, quay and bridge inspection

Technical specifications

• Model: HN-400M
• Type: Multibeam echosounder (dual-frequency)
• Frequencies: 400 kHz and 550 kHz (FM CHIRP)
• Operating depth: 0.2 m to 200 m (environment dependent)
• Swath coverage: 145°, up to 6× water depth
• Integrated IMU: yes, 0.03° roll and pitch accuracy
• Resolution / accuracy: < 10 mm (product specification)
• Weight: 3.5 kg
• Dimensions: 161.5 × 111.5 × 179 mm
• Positioning: GNSS support; IMU for motion compensation
• Sensors: SVS supported
• Software: EasySail Android (one-touch workflow, real-time preview)
• Installation: factory-aligned, no calibration required at installation