Which ARPA feature helps determine whether another vessel has changed course by showing a trail of past positions?

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The trail of past positions is shown by the history display. By plotting where a target has been over time, it creates a visible path behind the vessel. Watching that path lets you see if the target has changed course: a curved or kinked trail indicates a maneuver, while a straight line suggests the vessel is continuing on the same course at a steady speed. This makes it easy to distinguish a course change from a simple speed variation. Other features serve different purposes: the heading flasher shows the current heading, color coding conveys speed or threat level, and the scale bar indicates the radar range.