ABSTRACT The purpose of this study is the development of a training system for improving technical skills of canoe slalom athletes. One of the most important technique in the canoe slalom competition is the selection of optimal line between the gates. We are trying to visualize the path line of canoe to understand the difference from the optimal line. As the first step to develop the training system, we understand the characteristics of self-position estimation using BLE beacon. The results show the beacon needs to keep the distance less than 1m.