We had already reported the results of the Short-Term-Directional-Wave-Buoy. But there was a problem on the directional data. In another words, there was time drifting problem on the directional sensor. Since we have had this problem, we correct the buoy-coordinate-system-based data to the data based on space coordinate system by using the wind-vane on buoy itself. Then by measuring the wind direction, we could estimate the buoy direction. This time, with solving the directional sensor problem, correction of measured time history by using measured buoy direction was done, and the improvement of Short-Term-Directional-Wave-Buoy has been confirmed through the numerical simulation, tank experiment and reliable field data were obtained.