Integrated Navigation Test 1 Practice

In navigation, CPA stands for Closest Point of Approach. It’s the moment when two moving objects—such as ships—are nearest to each other if they maintain their current headings and speeds. This minimum separation distance is what you use to judge collision risk: if the CPA distance is safe, you’re not on a collision course; if it’s too small, you need to take action. The other terms listed aren’t standard for this idea and don’t describe the moment of minimum separation. The real, widely used term is Closest Point of Approach.