What type of information does the TACAN subsystem relay to aircrew?

The TACAN subsystem, which stands for Tactical Air Navigation, is designed specifically to provide navigation information to aircrews. It accurately determines an aircraft's position relative to a ground-based TACAN station, relaying data that includes bearing and distance from that station. This capability is crucial for pilots to navigate effectively in both familiar and unfamiliar environments, ensuring they can adjust their flight paths accordingly.

While other options may refer to important aspects of flight operations, they do not describe the primary function of TACAN. For instance, weather updates, while relevant to flight safety and planning, are provided by other systems. Flight path details could be influenced by TACAN information, but the subsystem itself does not create flight plans; it simply aids in navigation. Fuel management is another critical component during flight but is unrelated to the specific navigation functions of TACAN. Thus, the primary role of TACAN is to deliver navigation information, making it the correct choice in this context.