Explanation: On a radar display, a **vector** is a graphical representation used to predict a target's future position. It originates from the target's current position marker. The *length* of the vector is scaled to represent the target's speed over a specific time interval, while the *direction* of the vector indicates the target's course or true bearing of movement. This allows operators to quickly assess potential collision risks or target trajectories. An Electronic Bearing Line (EBL) is used to measure the bearing to a target from the observer's vessel. A Range Marker indicates distance from the observer, often as concentric circles or adjustable lines. A Heading Marker simply shows the direction your own vessel is pointed. None of these options convey a target's speed or course through the length and direction of a line originating from the target itself.