Apparent wind that measures wind speed in knots and wind direction in degrees relative to the heading of the boat. Modern instrumentation can calculate the true wind velocity when the apparent wind and boat speed and direction are input. In sailboat racing, and especially in speed sailing, apparent wind is a vital factor, when determining the points of sail a sailboat can effectively travel in. A vessel traveling at increasing speed relative to the "prevailing wind" will encounter the wind driving the sail at a decreasing angle and increasing velocity. Eventually, the increased drag and diminished degree of efficiency of a sail
Wind power in Turkey Wind power in Turkey Wind power in Turkey is gradually expanding in capacity, mainly in the Aegean and Marmara regions. As of July 2017, Turkey had about 6,5 GW of installed capacity and a further 808 MW under construction. The technical wind energy potential is estimated to be about 114 GW of capacity in regions where the wind speed is higher than 7.0 meters above the ground at 50 meters’ height. The first wind farm was built in Izmir in 1998. In 2006, 19 MW of wind power was installed, and in 2007, capacity increased to almost 140 MW. According