What connects the position symbol with the Full Data Block (FDB) in radar operations?

The connection between the position symbol and the Full Data Block (FDB) in radar operations is established through the leader line. This line visually links the position symbol, which represents the aircraft's location on the radar display, to the FDB that contains comprehensive information about that aircraft, such as its identity, altitude, and other pertinent details.

The leader line ensures that the controller can easily associate the position of the aircraft being tracked with the detailed data provided in the FDB. This clear and direct visual relationship is crucial in enhancing situational awareness, enabling the air traffic controller to make informed decisions quickly and accurately.

The other options do not fulfill this specific function. A flight path indicator shows the expected trajectory of an aircraft but does not directly connect it to the data block. A vertical speed indicator provides information on the rate of climb or descent but is not involved in linking the position symbol with the FDB. Similarly, a directional marker indicates the aircraft's heading but does not serve to connect the position symbol directly to the FDB. Thus, the leader line is the appropriate mechanism for this connection in radar operations.