Apparent wind in knots and degrees. Note that a number of additional factors come into play when converting the measurements from the masthead anemometer into the true wind if a high degree of accuracy is required, including the following: In the presence of a current, the true wind is considered to be that measured on the craft drifting with the water over the bottom, and wind with respect to the sea bed as the "ground" or "geographical wind". The apparent wind on board (a boat) is often quoted as a speed measured by a masthead transducer containing an anemometer and wind vane
Wind power in Thailand kW capacity at Hua Sai District in Nakhon Si Thammarat Province, and later in 2009, another of 1.5 MW capacity. Also in 2009, two wind turbines of 1.25 MW capacity each were installed by EGAT at the upper reservoir of Lam Takhong Cholapawattana power plant, a hydroelectric power plant in Sikhio District, Nakhon Ratchasima Province, becoming Thailand’s first large electricity-generating wind power plant. Thailand has relatively low average wind speeds with most areas being of class 1-1.4 wind speed, or about 2.8–4 m/s measured at 10 m. This is because Thailand is near the equator which has generally low wind