Closest Point Of Approach
Closest Point of Approach (CPA) is a term used in maritime navigation to describe the minimum distance between two vessels that are on a potential collision course. It is the point at which the distance between the vessels is closest and is calculated by taking into account the speed, course, and time to closest approach of both vessels. CPA is a critical factor in determining the risk of collision and is used by navigators to take evasive action if necessary. It is typically displayed on a ship's radar and is constantly monitored by the officer on watch.
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