Preventing marine accident of a small vessel like fishing vessels and pleasure boats is important for lifesaving, and it is necessary to make a contact the rescue team immediately to stop such accident. Current major way of marine accident notification is by using AIS or Satellite communication based method. Although these methods are effective for notifying, it is difficult to equip all small vessels the reasons of cost and regal obligation. We propose the marine accident preventing system for small vessels. To realize the target system, it is necessary to solve two kind of issues, such as the system design with easy installation and low cost and health condition monitoring, and transmission control with high transmission success rate. In this paper, we propose a smartphone and wearable heart beat monitoring device based system, and describe about LTE/3G communication quality in the Coastal Waters of Tokyo.
