What does CPA stand for in ARPA terminology?

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What does CPA stand for in ARPA terminology?

In ARPA terminology, CPA stands for Closest Point of Approach. It refers to the distance between two vessels at the moment they would be closest to each other if both continue on their present courses and speeds. This forward-looking measure is used to assess collision risk—the smaller the CPA, the higher the potential risk, especially if it falls within a defined safety threshold. CPA is typically considered alongside Time to CPA (TCPA), which tells you how long until that closest point occurs. For example, if two ships would pass within a half-mile in eight minutes with current tracks unchanged, the CPA is 0.5 nautical miles and TCPA is eight minutes.

In ARPA terminology, CPA stands for Closest Point of Approach. It refers to the distance between two vessels at the moment they would be closest to each other if both continue on their present courses and speeds. This forward-looking measure is used to assess collision risk—the smaller the CPA, the higher the potential risk, especially if it falls within a defined safety threshold. CPA is typically considered alongside Time to CPA (TCPA), which tells you how long until that closest point occurs. For example, if two ships would pass within a half-mile in eight minutes with current tracks unchanged, the CPA is 0.5 nautical miles and TCPA is eight minutes.

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