Knot (unit) fluids (tidal streams, river currents and wind speeds) are also measured in knots. Thus, speed over the ground (SOG) (ground speed (GS) in aircraft) and rate of progress towards a distant point ("velocity made good", VMG) are also given in knots. Until the mid-19th century, vessel speed at sea was measured using a chip log. This consisted of a wooden panel, attached by line to a reel, and weighted on one edge to float perpendicularly to the water surface and thus present substantial resistance to the water moving around it. The chip log was cast over the stern of the
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