What is TRUE of the history display of a target's past positions on an ARPA?

The history display on an ARPA (Automatic RadarPlotting Aid) system provides a visual representation of a target vessel's past positions, which is important for understanding its behavior and trajectory over time. In the true presentation mode, this display is useful for quickly assessing whether the target vessel has altered its course. By observing the historical track, navigators can evaluate shifts in direction and make informed decisions regarding potential collisions or required maneuvers.

This capability is critical in navigation, especially in congested waters where multiple vessels may be interacting. Unlike other functions of the ARPA, which might focus on immediate navigation information or collision assessments, the ability to visually check for course changes is essential for ongoing situational awareness and proactive decision-making in navigation safety.