We developed a new drifting buoy using Android smart phone. The drifting buoy can ct its position using GPS system and also measure wind velocity and direction. The asured data can be immediately transmitted to a distant location by 3rd or 4th ration mobile ne network. Field tests were conducted to verify its basic function and found that the stem can work in nearshore area for many hours without human intervention nor network tion errors. The developed buoys were applied to field tests for measuring horizontal rbulent diffusivity of floating thin oil and tracking drifting oil patch position. In addition to oil spill response applications, other potential applications using the Android smart phone as an embedded system are also proposed.