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SL20 Water Sampling & Monitoring Boat


OceanAlpha SL20 Autonomous Survey Boat is specially designed to be compact and portable unmanned surface vessel for hydrographic and bathymetry surveying work. With an extremely low draft of 15cm, the SL20 USV allows you to survey freely on offshore coasts, shoals and reefs where traditional manned vessel unable to enter.

 Sales enquiry

Data Sheet Overview

Autonomous Survey Boat

A compact and portable unmanned surface vessel for for hydrographic and bathymetry surveying.

 Auto-pilot And Realtime Data Telemetry

   The SL20 USV supports both remote control mode and auto-pilot mode, performs great line tracking capability.
   The base station can be easily set up on field, data can be transmitted in real time.

Compact and Long Endurance

   The SL20 USV is 1 meter long and weights 17 kg, it’s easy for one man to operate and transport.
   Powerful battery and low power consumption supports 6 hours of endurance at 3 knots.

 Adaptable to extremely shallow water

   With an extremely low draft of 15cm, the SL20 USV allows you to survey freely on offshore coasts, shoals and reefs
   where traditional manned vessel unable to enter..

 High Speed and Well Protected Propeller

   Waterjet  propulsion system drives the maximum speed to 5m/s
   Safety protection avoids the propellers being intertwined with water plants or water debris.


Hull Material Carbon Fiber
Dimension (L)105 cm *(W)55 cm *(H)35 cm
Weight (excl. ADCP) 17 kg
Payload 8 kg
Draft 15 cm
Propulsion  water-jet propulsion
Moon Pool 177 mm
Communication Range Autopilot: 2 km    Remote Control: 1 km
Remote Control Frequency 900 MHz/ 2.4GHz
Data Telemetry Frequency 2.4 GHz/ 5.8 GHz
Survey Speed 2-5 knots (1-2.5m/s)
Max. Speed 10 knots (5m/s)
Battery Life 6 hours (1.5m/s)
Battery Pack 1 x 33V 40Ah
Quick Battery Replacement
Instrument SOUTH 18S SBES 
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Linkquest Flowquest
Options ADCP data telemetry