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 Morocco Wind power in Morocco In terms of wind power development, Morocco enjoys quite favourable wind resource patterns, both in the northern part of the country near Tanger and to the west where certain regions benefit from regular trade winds. In 2013, 5,05% of electricity produced in Morocco was coming from wind power. Wind power could be a major contributor in the electricity sector of Morocco. According to data presented by minister Amara in Madrid in 2015, the country’s onshore potential is estimated at 25 GW, of which 6 GW could be installed by 2030. The average wind speed is 5.3