What is a "TAC" chart and its relevance in IFR navigation?

A TAC chart, or Terminal Area Chart, is specifically designed to support navigation in busy terminal airspace. These charts provide pilots with a detailed representation of the airspace surrounding major airports, including prominent landmarks, obstacles, and airways, which are crucial for maintaining safe and effective navigation during the critical phases of approach and departure. The design of TAC charts offers a more zoomed-in view than standard sectional charts, allowing pilots to better situate themselves in relation to both the airport and surrounding traffic.

This level of detail is particularly important in congested areas where traffic management is key to avoiding potential collisions and ensuring efficient operations. The charts also include important information such as VFR waypoints, and communication frequencies, which aid pilots in their navigation.

The other choices do not accurately reflect the purpose of TAC charts, as they are not limited to visual flight rules, do not focus solely on air traffic control regulations, and are not designed exclusively for oceanic airspace. This underlines the significance of option A as the only accurate and relevant definition of TAC charts within the context of IFR navigation.