What is the significance of the history display on ARPA?

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The history display on ARPA shows where a target has been over time, leaving a trail of past positions on the radar plot. This visual history lets you see how the target has moved, not just where it is right now. By watching the trail, you can tell if the target has changed course or speed, or if its bearing relative to you is staying the same while range changes. This helps you assess collision risk: a target that keeps a constant bearing while range closes is a warning sign, while a changing path indicates the target is maneuvering away or crossing your path.

It's all about motion over time, so you can quickly gauge whether a target is likely to pose a danger and decide on an appropriate maneuver. The history display isn’t just the latest position, and it’s not about weather trends or your own future path alone. It provides the track the target has taken, giving you context to interpret current movements.