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Definition of Closest point of approach
1. Noun. (context: nautical navigation) An estimated point in which the distance between two objects, of which at least one is in motion, will reach its minimum value; abbreviated CPA. The estimate is used to evaluate the risk of a collision of e.g. two ships. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Closest Point Of Approach
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