•POSEIDON system is made up of the following main components :
  • •Network of observation buoys
  • •Data transmission telecommunications systems
  • •Operational center with forecasting numerical models

Observational buoys



•The SEAWATCH WAVESCAN buoy is a versatile instrumentation platform that has been designed to provide less drag and large buoyancy making it well suited for deep offshore locations or areas of strong current forces.
•The SEAWATCH buoy is a stable instrumentation platform that has less buoyancy than the WAVESCAN and it is well suited for medium water depths.
SEAWATCH Deep Sea Module


•The SDSM is a seabed observatory with acoustic communication which allows the integration of additional modules into existing buoy based systems.
•The buoys are equipped with sensors that monitor: 
  • •Air-pressure 
  • •Air-temperature 
  • •Wind speed and direction 
  • •Wave height, period and direction 
  • •Sea surface salinity and temperature 
  • •Surface current speed and direction
•In two sites additional deep physical and biochemical observations are made: 
  • •Salinity and temperature at depths 20-1000 m
  • •Chlorophyll-A and light attenuation at 20-100 m
  • •Dissolved oxygen at 20-100 m
  • •Current speed and direction at 20-50 m
  • •Radioactivity
  • •Radiance - Irradiance


•More information about POSEIDON buoy network

Telecommunication systems

Satellite INMARSAT-C





The Operational Center of POSEIDON


  • •High performance computer system (SGI Altix 3700 High-Performance Server) with 128 CPUs Itanium2@1.5 GHz and 128 GĀ RAM on board, providing adequate power for the forecasting model's integration.
  • 45 TB of Hard Disk Drives.
  • 10 Dual socket Linux Workstations for data analysis and presentation.


  • •Poseidon Live Access Server (LAS) which provides access to forecasting models results and to data collected from the buoy network.
  • •Software for the statistical processing and analysis of data.
  • •Software for the presentation of the statistical analysis results as well as of forecasting models outputs.
  • Geographical Information System (GIS) for monitoring the operation of POSEIDON in real time.

             The numerical models to forecast

  • •Atmospheric conditions
  • Offshore wave height and direction
  • ••3-D general circulation
  • •Ecological dynamics and characteristics
  • •Oil spill dispersion and weathering

Latest Data
Weather Forecast
Click for the latest data transmission
forecast over Greece


POSEIDON system funded by:

Financial Mechanism of the European Economic Area - EFTA &
Greek Ministry of National Economy


Poseidon Weather now on Android Market


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