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GPS Comprehensive Oceanographic Monitoring System (GCOMS)

The GPS (Global Positioning System) Wave Meter developed by Hitachi Zosen is currently operating at 15 sites around Japan, having been adopted by the Ministry of Land, Infrastructure and Transport and Tourism in FY2005.
Tsunami wave heights in the Great East Japan Earthquake were measured by GPS Ocean wave meters installed in the Pacific Ocean off the coastline of the Tohoku region as well as in the Tokai, Kinki and Shikoku regions.
The world's first wave meter capable of measuring tsunami wave heights in real time from a position far out at sea, the GPS Ocean wave meter is now subject to worldwide demand, particularly from countries with a history of tsunami events such as Chile and Indonesia, and is sure to play an important role in tsunami prediction around the world.

Major products

GPS ocean wave meter and tsunami meter

A GPS antenna mounted on top of a buoy obtains real-time sea level data based on satellite positioning. The buoy has a structure that withstands severe oceanic conditions such as typhoons. Its position is maintained by a mooring rope tied to an anchor placed on the seabed. The power required for lamps and observations is supplied by solar energy generation. Conditions such as the temperature and humidity inside the buoy, and whether there is water leakage or not, are remotely monitored.

Multi-functional observation buoys

A floating fish-breeding reef is equipped with various observation devices and transmits information used for marine traffic and fishery activities such as data on the wind direction, wind speed, flow direction, flow rate, water temperature, and atmospheric temperature. Wave observation units can be mounted on existing buoys. We offer products ranging from a small observation buoy to a large floating fish-breeding reef.

Observation monitoring systems

Filtered measurement results from a GPS wave meter, tsunami meter and a multi-functional observation buoy can be used to observe waves of a short cycle and sea levels of a long cycle. Our tsunami system is different to other tsunami meters, especially because it is free from noise factors such as seismic ground motions and because it captures tsunami wave figures not by measuring seafloor water pressure changes with a seafloor bottom pressure recording device, but by directly measuring real-time buoy positions on the sea. Hitachi Zosen has publicly released observation data from offshore demonstration tests of a GPS tsunami meter near Muroto.

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