The ubiquitous network which made the city waterside the model-A subject is a measure against a child's damage-at-sea accident-

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The object of studying us was to evaluate experimentally the system adapted to the ubiquitous information society with which a maintenance and safety of waterside environment for the child who resides in a city to be familiar positively are compatible. As a result of analyzing a questionnaire to a child, the accident acknowledge changed with a habitation location or age. Moreover, the accident which does not appear in survey statistics of a public institution was confirmed. Based on these results of an investigation, we made the observation system as an experiment by the Build approach of the outdoor sensor network called a field server. The trial production system constituted the mesh network and succeeded in the acquisition of the sensor information.