A small vessel like a fishing vessels and pleasure boats account most of the marine accidents with the fatality or missing person in these five years. For preventing such a marine accidents, it is important to make a contact immediately to stop such accident. Current major way of accident notification is by using AIS or Satellite communication based system. Although these ways are useful for marine accident detecting, it is not mandatory to equip those systems to a small vessel. Furthermore, current systems are expensive for a small vessel. In this study, we focused on that 3G radio communication having possibilities to be available in coastal waters of Tokyo, measured 3G radio field intensity by developed measurement system in Tokyo Bay and Uraga Channel. From the results of the measurement experiment, we showed the 3G radio can receive on the sea of around 5km from the land and near the sea surface. The realization of new marine accidents prevention system can be expected by utilizing the 3G communications in coastal waters of Japan We described the design of the system that takes into account the characteristics of 3G communications on the sea.

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Regarding the development of a land support system based on weather routing to calcu 塾 ate the optilnal route of the vessel ， which is required to use the high accuracy datasets of predicted ocean environments ． However 」 recent weather routing services are not possible to forecast the enviro 皿 nental da耄 asets and depending on a few forecast agencies with high − cost in the limited sea ar 翩 ， Jn this paper ， we develop a numerical weather prediction system f｛)r the weather routing service ， which is based on the parallel processing t。chn 。 logy． 血 addition ， we propose a package − based depl。 yment mech

Regarding the development of a land suppo 提 system fbr the weather routing to calculate the optimal route of the vesse1 ， which is required to use the high accuracy datasets of predicted ocean environments ． Howeve ら recent weather routing services are not possible Io fbrecast the environmental datasets by themselves and use limited datasets by fbrecast agencles with high・ cost in the limited sea area ． ［ nthis paper ， we show the fbrecast results of the surface wind velocity at a locai sea are 灸 which is based on our cluster system ， In addition ， we evaluate the fbrecast accuracy of the sur飴 ce wind velocity between the WRF (Weather Research and Forecasting) and 出 e GSM (Global Spec錠al Model)models ． FinalIy ， we meas 皿 e dle peak pe 面 mance of

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