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Data Sheet Application Notes

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OSIL 1.2m Coastal Monitoring (Tern) Buoy

The Tern buoy is designed for extended deployment in harsh coastal environments in deeper water depths, and is suitable for all applications, including scientific studies, water quality monitoring, coastal engineering projects, harbour and coastal monitoring, and maritime traffic control.


The buoy system is extremely robust, with all instrumentation and cables held internally, protected by the rugged enclosed top section, which has been designed to minimise damage from the elements or interference. All sensors are secured within a central structure which offers good water flow for water quality sensors, while also providing a very high degree of protection for valuable, sensitive, or delicate equipment. The platform also offers a higher visibility profile, easily seen in high-traffic areas.


The versatile 1.2m platform has approximately 400kg net buoyancy, and is supplied with a range of sensors that can be specified by the customer (including CTD, DO, pH/ORP, Turbidity, Chlorophyll, Rhodamine, current speed/direction, as well as a GPS locator).


All buoys are fitted with solar panels, battery back up, navigation/warning lights (IALA Standard Lamp) and other markings as necessary (St Andrews cross, Internal Radar Reflector etc.).


A range of telemetry options are available (UHF/VHF, GSM, GPRS, Satellite), selected to suit both the location and application requirements.


OSIL provide a complete data telemetry solution, including either desk top or web-based software packages to access the data. 



Increased buoyancy over other designs

Robust construction

Modular design makes it easy to replace damaged parts

simple structure to work on/with

Good sea-keeping design properties

Avoids the need for external data cables

Sensors are fully protected in central structure




Robust construction

Rotationally moulded foam filled PE hull
Modular design for easy transport

Through hull compartment for safe positioning of equipment 

All cables & instrumentation held internally

High-visibility profile


Water Quality Monitoring
Scientific Studies
Coastal Engineering
Maritime Traffic Control
Harbour & Coastal Monitoring 

Technical Specifications 


Reserve Buoyancy (after payload)
Focal Plane



  • Met (Wind speed & direction, Temperature, Barometric Pressure, Humidity, Precipitation, Visibility, PAR)

  • Water Quality (CTD, DO, pH, Turbidity, Chlorophyll A, BGA, PCO2, TSS)

  • Oceanographic (Current speed & direction, Tides (subject to deployment conditions), Wave height & direction)

Additional sensors can be incorporated, please contact us for details.

Multiparameter Sondes

Current Meters

Data Loggers

Seabed Frame


Marine Instruments


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