The ARPA term CPA refers to which of the following?

The term CPA stands for Closest Point of Approach. In maritime navigation and radar operations, it refers to the point in time and space at which a vessel or target comes closest to your ship. Understanding CPA is crucial for preventing collisions and maintaining safe navigation, as this measurement helps mariners assess potential collision risks and take appropriate action if necessary. By knowing the closest point of approach, navigators can make informed decisions regarding course alterations or speed adjustments to ensure safety at sea. The other concepts related to detection, direction, and processing of targets provide valuable context in navigation but do not directly define the specific term of CPA.