Course Over Ground
Course over ground (COG) is a term used in navigation to refer to the direction in which a vessel is traveling along the Earth's surface, measured in degrees from true north. It is sometimes also referred to as the track made good, true course or ground track. Course over ground is the combination of the vessel's heading and the influence of the wind, wave, and current forces. This differs from the vessel's heading, which is the direction in which the vessel is pointing. COG is an important concept in navigation and can be used to calculate the vessel’s position. It is also used to determine the true bearing of a point, which is the angle between the north direction and the direction of a point on the Earth's surface. COG is calculated using two inputs: the vessel's heading (true or magnetic) and the set and drift caused by external forces such as wind, waves, and currents. The course made good (CMG) is the angle between the north direction and the direction of the vessel's current position. The difference between the vessel's heading and CMG is the set and drift, which is used to calculate COG. COG is used for all types of vessels, from small pleasure boats to large merchant ships. It is essential for navigation, as it helps to determine the vessel’s position, course and speed. It can also be used in safety management by helping vessels to avoid collisions, as well as in boat efficiency by helping vessels to sail the most efficient course.
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