The OT-Echo Buoy could be traced by GPS. The user can easily trace and acquire all data through the website which is provided by Oceantech. With CDMA communication, the interval is 1 sec and the data transmit rate is 1 min. The OT-Echo Buoy can measure water temperature and water depth as well by an option. This information enable to infer the route and time of the lost articles in case it’s carried away by flood or current.