Explanation: The Electronic Bearing Line (EBL) is a navigational tool, primarily used with radar systems, to determine the angular direction of objects. When displayed on a radar screen, the EBL is a rotatable line that originates from the center of your vessel's position. Operators align this line with a desired target on the radar display, and the system then provides a precise numerical readout of that target's bearing, either relative to your vessel's bow or as a true bearing. Therefore, measuring the bearing of a specific target is the direct purpose of the EBL. Option A is incorrect because your own vessel's heading is typically indicated by a fixed heading marker on the radar display, not a movable EBL. Option C is incorrect; True North is usually indicated by the radar's orientation mode (e.g., North-up) or a specific North marker. Option D describes the function of a Variable Range Marker (VRM), which measures distance, not direction.